Critique:
It is lacking depth. To be honest, it looks like you put the dino on top of a wave like something.
I would get rid of the grunge. Really doesn't go well with this. Or atl east blend it.
No flow. You may want to add a shockwave like pattern to visualize a roar. This wave is making it look like brickwork.
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Also, there is flame like thing coming out of the dino, but all the yellow (?) is entirely opposite to the mouth!
Lighting = where?