Wow! Extraordinary piece of work! I think you captured this pokemon tremendously! If I may have your permission, may I use this specific work in a project of mine (not school work, personal project). Rights and copyright would be cited for you of course!
This is just...wow. I love how you cropped it and brought Spiritomb to life...er, afterlife with that dynamic pose!
The only thing I can find to critique is the color of the watermark...since red wasn't used as prominently as purple and green and was used to blend into the other colors, it looks a bit awkward to suddenly have it at a high opacity, by itself, in one corner of the picture.