I agree with mozzy: you still need to complete the character before making more frames of him.
I feel that you are aiming to use shape more than line when designing this guy. The patches of color stick out to me the most and help me to distinguish him.
Do you plan to add detail, such as texture, line, or shading? Or do you want it to remain basic and simple? I suggest establishing this before you take another step in development so you can keep your stylization in check and consistent.
THe only thing that I would say is a definite is some work on the face: unless you want it to remain extremely simple, he needs more to his face. The face is the identity of the character, and is what gives the player much of the information about him. If you cant quite get the face to look right (tiny faces are a pain in the pixel world, arent they?), we would be glad to help.
If the blue on the shirt is meant to be shading, I dont really feel that it contrasts enough with the shift to let the player see it. Try lowering the value in that blue to make it more distinct.
Great start with this guy!