AUTHOR'S NOTE;;
Heck yes keep them OCs rolling in mmhmmmmmmmmm.
This one here belongs to Destiny508. Thank you for submitting Coldfront for a rating! I really enjoyed learning about him.

- Siri Mom.

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BASIC DETAILS;;
------ Name: Coldfront.
Seems fairly unique; I don't think I've met any dragons with that name before.

------ Age: 10 years.
*shrug*

------ Gender: Male.
Nice.

------ Tribe: IceWing.
We do have quite a few IceWings in the fandom, but I can't exactly go picking on you for that. So, cool (ha).

------ Mate: Dusk (NightWing).
No comment here.

----- Dragonets: Northstar (daughter), Destiny (son), Everest (daughter), egg (dead), Planetseeker (son).
Tag yourself I'm "egg (dead)". If you'd like a better way of saying this, try saying "unhatched/stillborn egg (deceased)".
I'd maybe think about renaming some of those dragonets. Everest is actually more of a SkyWing name than an IceWing name, and Planetseeker just sounds odd. Unless Planetseeker is an astronaut, I really would change it to something a bit... tamer.

------ Family: His mother and father were murdered by his grandfather because Coldfront's mother was the daughter of his rival and he forbade Coldfront's father from marrying her.
Wait... what?
This is unnecessarily violent. I suppose it could slide, provided you have a very good explanation.

Sleet (mother), Hail (father), Polar (older brother), Tundra (twin sister).
I like the detail here, at least. It's always nice to give a bit more insight into the character's family, and names really help lighten everything up.

------ Treasures: A crystal necklace his mother had gave him the day she died.
The whole thing with dying parents giving their children jewellery is a bit overused, I'll admit. Actually, the whole dying parents thing is pretty overused. But this is quite cute nonetheless.

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PHYSICAL DESCRIPTION;;
Sky blue scales with white talons.
That's a little bit short, really. Why not try open up a bit more? You could think about things like eye colour, any scars, accessories, markings, his height or his build (fat, thin, muscular, scrawny, etc). Are there any major eye-catching things about him, like one broken horn or a torn wing?
Don't be shy! There are loads of things you could talk about.

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PERSONALITY;;
Creative, loner.
O...kay.
While I think that the two traits are a very interesting combination, you need way more information in this dragon's personality. If I asked you to describe yourself, I doubt you'd come up with two words.
Personality is what makes a character unique!
If you're having some trouble with developing one, maybe sit down and imagine having a conversation with your OC. Ask him about what he enjoys, how he feels, and gradually build up information about him just as if you're making friends. Some helpful questions to ask could be things like his favourite colour, favourite food, if he enjoys being an IceWing. How he feels about his family. Why he's a "loner" - is he shy? Sad? Does he just find other dragons annoying? Or do other dragons avoid him? In what way is he creative? Does he have any hobbies? How does he feel about the NightWings? How does he feel about Queen Thorn? Does he respect his own queen? Or is he an outlaw?
Really, you could find out infinite things about him.

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BACKSTORY;; Coldfront's life was harsh since the day he hatched. He was almost devoured by an orca after his older brother had pushed off a low cliff.
I couldn't tell by your grammar if you meant that his brother was pushed over a cliff or that his brother pushed him. I'm going to assume the second.
Firstly - why does it have to be so tragic? You've got great leverage already with the death of his parents; use that! Make that tragic! Adding in the part about his brother is unnecessary and needs an explanation: why did his brother push him?
("Because he was cruel" is not an excuse).
Secondly - how did he even survive that? If he was a newly-hatched dragonet, he would be dead in seconds. He's been thrown off a cliff - chances are the hard landing in the water would knock him out or in the least stun him. The sudden cold would hinder his motion, and his tiny dragonet limbs would be unable to fight the harsh current. On top of that, an orca could devour a dragonet in seconds; orcas are fast creatures and very effective killers, so his chances of escape would drop to zero. Even if he somehow did manage to escape, there's still an entire body of water to contend with; and if he was newly-hatched, chances are he'd barely be able to walk, let alone swim or fly out.
And if he escaped, how would he survive? He's a baby dragonet who can't hunt or feed himself. He'd have to have some help from scavengers or another dragon - if the animals didn't already eat him by that point.
Really, there is no logical way a dragonet of his age would be able to survive any of that. So, this needs some work.
EDIT - how did his mother give him a necklace then?

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COMMENTS;;
------ The good...
The basis for a good OC seems to be there. You've come up with a decent name, and you seem to have gotten to know him pretty well. Also, this fandom needs more male characters, so congrats for that. I also like the major personality flaw of being completely dependent on Dusk.

------ The bad...
I'm sorry to say, but your backstory needs a lot of changing up. You've got altogether too much tragedy in there, and none of it seems to have affected his personality. The loss of his parents is one thing - his brother pushing him down a cliff for a whale is a whole new level. There is literally no chance a newly-hatched dragonet could survive that.
In addition to this, you really do need to work on that personality. It has no detail. Which is a shame, because he sounds very interesting.

------ How you can improve!
The only major areas in which you could improve would be your backstory and personality.
Let's tackle the biggie of the two first.
If I were you, I would completely erase the part about his brother throwing him off a cliff. It just makes his life seem too tragic, and too much like a sappy sob story. You may as well hold up as sign saying "Pity me, please!". By taking this out, you leave room to focus on the loss of his parents.
If you still really really want to keep the concept of an abusive brother and him being thrown off a cliff, you could always add them on later in life. But all that for a little new-hatched baby dragon is a bit unrealistic, and also seriously over-dramatic.
Aside from this, you need to go into more detail with his personality. Two words won't cut it - you need to make him interesting! You don't have to write long essays, but a few more words and explanations certainly wouldn't hurt.

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OVERALL RATING;; 4/10.
I'm really sorry. This character has a lot of potential. But I think you need to sit down and think just a bit more about what you're doing with him. You need to pay more attention to his personality and possibly neaten up his backstory a tad.

But I really do think this character could become a great OC, with a bit of effort.

Good luck, my friend! And thank you for submitting.

- Siri Mom.