This is a naga Character of mine, his name is Jal (which I had to look up and is supposed to mean "wanderer" but it could be wrong...)

Anywho you can't tell in the sketch but he is based off of a Gaboon Viper, I didn't have access to a picture of one at the time that I drew him so the patterns aren't there... Yet...

Here's a chibi version~

And then a close up of his face

The thing around his neck holds a potion that acts sorta like an anti-venom

( And he's a worry-wort so that's why he has that expression. )

Side Note: he is estimated to be roughly 32 feet long (about 975.36 cm) from the top of his head to the end of his tail-tip~
Though when in a resting "standing" position appears to be about 6'2" (about 187.96 cm).
He's about an estimated 3'5" (about 104.14 cm) at his widest (which would be the widest part of his snake half).