The still ones look pretty good but all of them lack knees and feet, even though the girl has shoes on. The walk cycle looks a bit wonky, I think due to the fact that the legs just shorten and get dark spots. Try drawing on some knees and feet (for these you could maybe just shrink the ankles to suggest them) so it makes more sense to the viewer. The top of the head could use some shading IMO, though it could work without it.
Good palettes on all, but the blue is a bit too unsaturated I think. Bump that up just a little bit.