It looks amazing, it seems a real frog!! And the base is magnificent looks like a little pieces of earth freshly sliced and put in there.
If I had to point out something, I can only think of the frog skin adding a bit more of shine, I mean humidity on the skin, maybe?... but it is excellent!!
Edited for adding this:
Oh, I just read a few moments ago the article on yout blog, and I can see and understand your reasons about the shininess, on the other hand the "little" changes you made are adding even more positive points to the overall scene.