Make-up
If you are just exploring with make-up, I recommend Snazzaroo's. It comes off with water, and it blends well. The only problem is that if you were to run around outside you would sweat. This means that your make-up would slowly melt off.
If you plan on being outside or sweating, I suggest Ben Nye's. You should get the type that is cream based. If you need to get this paint off, just take a shower with it on, and rub it with a little soap, it should come off pretty easily.
When putting on your make-up, remember to put on the lighter colors first. If not, sometimes a darker color can show through and that would look REAL bad.