Comparing him to a normal won't do you any good. Normals can be incredibly varied and unique.

I don't think it's a yellowbelly. It does have a nice dark background, but there's no yellow or orange to speak of on the sides, the flaming is minimal at best, and while the belly gives me pause, I'm still leaning towards no.

This was a yellowbelly I owned, and he wasn't a great example of it either, but you can see how he has yellow on his sides, and some flames going on.