I think you should probably scrap these. Work on a good 1-frame portrait of the character first, and once you think you have something that reflects his character well start doing skeletons and simple line art of the various animations.
Adarias has a good point too - this is NOT a trivial task; PoP:SoT still has the most complete, fluid animation of any video game ever made; and they had the advantage of skeletal animation, allowing them to utilize physics, particles, IK, blending...a LOT of stuff that is inherently lacking in traditional sprite art (though a clever multi-sprite character might pull off some of it, but its hard to make that character not look like a doll without using vectors and solid colors as sharprm posted).