I think that the shape of the mouth sets it off making it not look like a panda.
Maybe the addition of a nose could help, but I believe that that kind of mouths only work on er... let's say "animals" with small snouts.
Might be a matter of style but doesnt convince me at all.
I just noticed that while you put some blue light source on the left (our left, and so making the hair blue/purple) it doesnt affect the arms nor legs on any but on the one holding the broom, so yeah you might want to check that.
Maybe the shadow that the hair makes could be AA'd better, but ah well.
Other than that, adorable.
Keep the "panda<3lvoe" coming
haha sorry XD