As said above, it's hard to judge if a partial animation will look good in the final result (with all the other moving parts added), because even though it might look okay if animated separately, it might look strange or unfitting in ensemble with the other limbs. so creating the thing as a whole (maybe with feet and hands separated for starters, as in the Rayman example) would give a more judgeable picture.
what's the animation to become anyway? still the limp walk? currently it looks more like she's kicking away some cigarette butt or something
. nevertheless, one thing that might look already strange (to me though, that is), is that the leg doesn't get shorter when lifting it, which it probably should, since it's being moved away from the viewer (because she's turned slightly looking towards us, and not fully sideways). so, now it looks more to me as if she's kicking halfway to the side, not straight back. also, I think she's lifting the leg to high, but that's once again better to tell if one can see the whole movement.
