You know,when I read the title, I thought of something totally different from what I you present here. Good thing it was different. The point I personally love the most about your drawing,is it's creativity and originality. I didn't expect to even see a large green creature watching over a bunny dressed girl with such a child like look on it's face. Furthermore,your art wins with it's vivid colours and of course the lovely shading.Thus,my favourite part of the drawing,is the little emerald creature that come out of the wall. The way it melts on the girl's hand is spectacular as well. Honestly,thank you for this drawing.
I almost feel uncomfortable writing a critique for you because I know I'm not even remotely a professional, but I feel that it might benefit you, if you heard what could be improved. It's not to bash you or anything, as a matter of fact I want this to help you.
Alright so...I immediately notice Riven which is a good thing. Unless this is a style you're going for, I would avoid the harsh black outlines. Sometimes it can make a picture look unfinished, especially if the rest of the picture doesn't have the same black outlining. The lighting was done well and you have a lot of nice texture with the leaves, stone, and moss. One of the more professional looking parts of this piece is actually her body. Her chest area looks the best because you colored and blended it so well. I think her legs could use the same TLC since they look rather harsh in some parts. Keep in mind legs look matte and soft underneath pantyhose because of the texture.
Other than that I'd say just keep practicing techniques. If you don't do this already, try working your pictures out in grayscale first so you can get a good visual image by only using black and white.