KFC, you might need to prime the torso before painting it. You might also want to sand it just a tiny bit. Just a light once-over with a fine sandpaper, then a coat of primer.
Also, are you letting the paint dry completely before applying another coat? That might be why it's cracking. And to avoid runs, just put on one light coat, let it dry, then put on more coats until you get the right thickness. And paint it while it's lying flat if you can. If not, paint from the top down so if it drips while you're working, you can just smooth it out.
LAWLZ Kameko! Those are hilarious! XD