The celebi looks great! There are some minor issues I have with the shading on the body, it's a little to straight, but overal it looks really great.
The mew is a fun one too, but the are a couple of issues with it. The highlights are placed weirdly, it makes mew look really slimy. It's position is very weird, as I can't how figure out how it's supposed to be standing. Also, the eyes are of different sizes, and it makes him look a little derpy.