Well, I guess at that size and stlye... the stumps make ok hands, you could put thumbs though I guess. As for cloths.... since the pallet is limited, use a solid of either your black or one of your greys. If you want a white shirt or pants, outline it with the black maybe.
Oh yea, if you want to define the hands more . I guess you have to first define the wrists more or make the hands huge. So... uhhm, kinda erase a few pixels or add some here and there to do that.