I like it! I like the brush strokes we can see and the blend of colors, like on Mewtwo's leg. Maybe the shadows could have been a bit darker? I'm not sure what else to critique, it looks very nice...Maybe the background is a bit too bright and yellow?
Yea I guess, but if you try to turn the picture into grayscale, there is actually quite sufficient disperse of scale, so I guess it is still fine somewhat? XD I wish I had a better idea for the background, though... But meh, I guess it looks good as a postcard nonetheless~