It's a good start, but there's a lot that needs adjusting.
To be honest, I can't tell what he's supposed to be doing. I think it would help you if you look at walk/run cycles first and learn how to animate something like that from a side view before you try a different angle.
This edit I made should clarify what I mean.
When his leg is outstretched like that, his other leg should not be visible from that angle. Either that, or his outstretched leg should bend instead. Also, his arms should be closer to his body and at a slightly different angle to make it look like he's running rather than coming to a halt. His legs should also be closer together, and his hips are too wide.
I didn't mess with the colors much. I think for that, it would be helpful if you showed us the type of background you intend to place him on. If it's a bright background, you'll need to lighten the shadows quite a bit. Desaturate them. Bring them more towards blue for an outdoor scene.
Looks like the light is coming from the top left, so his head should cast a shadow on his shoulder, and his front should be mostly in shadow. I think all the red is too saturated, and there's a shade of red there which is barely visible at all, so you can either get rid of it or make it brighter to make use of it as a highlight.
I hope that helps.
Looking forward to seeing the rest of it.
