Listen, you have a fetish for details, so I've noticed, and I really love the all land of oz twisting concept, reminds me a bit of the McFarlane action-figures, have you by any chance saw them in your mind before the drawing?
I loved the mutated lion, he stands best from them all. But the backgrounds are too childish, and are ruining this piece from standing out and be great. It as if you don't feel like you should invest time in making the backgrounds, I saw it also in your other works. IF you would give time and investment for details to your backgrounds as well as you give to the foreground, there is no stopping for your works to be grand.