I agree that the warm colors work well and pop out with the white. The green would have been a little distracting.
Not sure what is happening with the dinosaur's hind legs. I only see the thigh and it seems to disappear. Overall, it's a little too tight near the bottom of the image, and everything seems to overlap with other things. If you could allow the body to snake down more the lower body could be more clear with a stronger silhouette.