Okay, first of all, taking the timing away and centering the head of the character some problems become immediately apparent

Now look at how irregular the placements of your 'triangle' (the nodes in the joints) are. Should her waist node move all over the place like that? Also, look at the shape of the back leg as it drops from '1' to '2', not only does it morph, also notice the hell. It goes APEX (on 1), drops some (on 2) and then goes BACK UP (on 3). This doesn't happen when someone walks, and you'll note it's not in the ptoing reference either.
I suggest you keep the horizontal of the head constant as a newbie to animation, and if you need some vertical head bob, apply it in a pendulum, sine-wave type motion, not so jerky as you have it now.
On the bright side, the form of the front leg looks excellent to me on '1' and '2' and '3'
I hope some animation expert takes over from my critique soon though, heh
