Overdose

Really interesting concept! I really like it. The pose really intrigued me. Personally I would like to see more shading and for the shading that you have to be smoother and more gradual. One way you might do this is to see if you have a program with a blur tool. If you don't I would recommend downloading Paint.net. It's a very good program and the download is free!
I'd also recommend that you decide on a specific place for a light source for your picture so you can do your shading more effectively. Also if you do that your picture will have a more consistanct, natural, and finished feel. I would like to say that the placement of you shading is good it's just the shading its self that could use a little work.

I feel as though some of you proportions are off. I'd take another look and see if there's anything you can adjust. Maybe the hand or legs but some of those issues can be fixed with proper shading!

Overall really not too bad. I don't think I really could have done much better. Haha! I must once again point our how much I love the pose you chose, very original! I love it! Keep up the good work!