Hi I will say some things I would say the 1st paragraph is the more important stuff:
It is hard to tell the body from the head. The simplest way to fix this is just put a dark shadow right behind the head, onto the body. Make sure to outline the spikey hair things. Pay special attention to the section where the forward hump slopes down behind the hair tuft toward the neck. It is also hard to tell where the front facing body and the side of the body (where the blue rings are). If you look at the nintendo art you can see a shadow that separates these two faces.
In the source art the rocks are also the same color as the humps. Again you would distinguish every rock by putting a shadow'd outline on rocks in the back. There is also an odd bulk of rock toward the front of the 2nd hump, and the back of the 2nd hump should also be supported by rocks (it's kind of hanging precariously).
Anw yeah, if you have questions n stuff you know where to find me ps pick up a tablet don't b cheap!!!!!!_!__!_!_!_!_!__!11-!-_!_!