As a note, I'm not sure if you already know, but you can use the Print screen button (usually at the top right) of a windows keyboard to take a clean snapshot of your computer screen.
So far, it looks really good. Nice work. If you want some real tips to improve, my best bet would to say maybe something on his right thigh. I don't know if the shading is a pixel off or something, but it's weird. I think it's because the lighting looks like it's coming from both directions. I imagine angling up the shading there would fix it up nice and quick.
Otherwise, it looks great and I'd love to see it finished! I recently picked up pixelling for a project I finished not too long ago so I'm pretty much still honing the craft as well.
Also, sorry for drawing all over your work.