I know there's not quite an extensive amounts of mods that make Bully look more prettier and sharper.
Although I do know of this:
http://www.bully-board.com/index.php?topic=15103.0, but the textures aren't really "Bully"-like.
I was wondering if any one would try at converting or making HD textures to Bully. I did try to do it myself once, and it seemed it was working for a few textures, but some made the game crash.
This useful tool resizes images and makes them higher quality:
http://imgur.com/a/dyRCRAlso, maybe someone can edit stuff like menus, icons, and icons to be higher quality? I'm not too familiar or successful with editing, myself.