Look up walk cycle in Google Image Search and take a look at the pics. The straight-legged standing pose you have first won't be part of a (natural-looking) walk animation. You need to bend those knees, move those arms, and have the top half of the body bobbing up and down (up when legs together, down when legs apart). I'd suggest you start with blocked-in shapes or stick-legs instead of rough outlines.
What sort of style are you aiming for? Legs look too short for that body, I'd make the main body (waist to neck) shorter.
