Hi Shnurbs,
Funny piece
The black has too much contrast on the skirts, you should light it up a little bit.
Shadow on the knees should move has the skirt is getting up and down.
It's very difficult to read the facial expression. You could had a little more contrast and/or use brown eyes.
It would be nice if shoulders could have a little motion too, implying whole arms.
Would be nice if you could also get some bending on the knees.

good luck