Time: 10 min in each

I was bored at school again XD
So I started to draw green lines in where my veins where visible (basically the branches are my veins XD) and then I redrew the lines in a black color and lastly but not less important, I add the white dots with a pencil and corrector.

One of my classmates/friends saw me drawing this so she ask me for one too!!

I drew the branches and the tree in where her veins were visible as well