this gfx is a little strong for the age of a kid, this gfx I did for my cousin for his comic de mad city
Looks quite good my suggestions.
You should render your GFX, a bit more to remove a lot of those black spots on the characters. Hair,hat,head,clothes you should fix that issue!
You should lower down the fire. In the back of the red character body it’s looks a little to high on them as you see it’s on there hands, and hair and on the side of there body!!
And also you gotta fix the texture/color, on the characters clothes it’s a little white on the back of the characters body. And remove that glow on the other characters arm.
Keep it up!