Lol you posted your first comment on the wrong wall. And yes, they are .JPG. which is just about impossible to work with. then try resizing and reshading them to proper shades with proper outlines. Now you see what I truly do.
Make sure you dont offend any one by trying to outdo their work. That can and will get you in trouble.
BTW, what form of rendering were you thinking about anyway? And I want a copy of that sprite on my board when your down.
They must be 64x64 MAX if they are to fit in the game. So dont go throwing around that you know a lot about this. Rendering will do nothing, as you are simply changing to .PNG which will do nothing. It MUST BE 16 colors, technically 14 colors, as you need a blank spot for white and black each (trust me) So, any more bright ideas? Also, the size MUST make sense. Little grass-type squirrels are not the same size pixel-wise as a gigantic guardian of ice. So take size proportions into account as well. Next time you try throwing that around, please consult spriters and game developers first about what you should know.