Your shading and texture in the second image is ok. but the windows need shading to show form. Also i think the building will look better with a reddish dark color. Heres an edit showing what i mean.
Your first image looks kind of strange. Is he like walking against us? his shirt hanging out on one side is really hard to make readable on a 32*32sprite, same is a mutilated arm. you need to do it simple. if he has a mutilated arm you give him a stereotypical hook or something. Or you make one arm way shorter than the other. Also diss the chesthair. wont be readable in such a small sprite. The angle is also kind of screwed. His head is seen directly ahead but his feet seem to be seen from a 45 degree angle above. I don't think I'll edit this as it would have been very little left of the original image if i did. Just try to get it somewhat symmetrical and then pick a light source and shade it. Good luck
