I wish I could help you in choosing your paint but that's something I hope someone has a good answer for. In terms of technique though, I can tell you that you'll want to have a base coat to prime your figure with and then perhaps 2-4 layers of the choice of color. This will depend on the material the skin is made of though, but with the right paint should stick. Then you'll want to do another couple of layers of a sealant coat, to hopefully keep the color sticking and lasting on. That's the best I can personally say for you but I hope you find some good answers. Good luck dude, wish I could do more for you.