Thanks!!!

I'd suggest you create a waist, by darkening the waist area, highlight the beasts, darken the area under the chin, the elbows and the knees and the area between the legs and arms of your skin. darken the nose area and so on... there are some good tutorials for that! http://www.planetminecraft.com/blog/mayuris-hair-shading-tutorial/ Mayuri's hair shading tutorial aand for the body I found http://www.planetminecraft.com/blog/how-not-to-shade-arms-and-legs/ a tutorial from the_soup
Good luck!

My tip is to take a walk, see what teenage girls are wearing, how much and what kind of make-up do they wear. Or take a stroll in a clothes shop

What is the theme of the roleplay? I didn't find any blogs about clothing your skin, but I get inspiration out of the fashion magazines... try that, or at DeviantArt you can get some inspiration too! There are lots of custom made real life costumes, so maybe you can take a looke there?
Lola