A number of years back I began thinking of characters as boxes of parts, shapes, skins and eyes you could mix and match to get the best results. The advantage to thinking like this is that you are never locked into one look for a character. Something as simple as changing their skin can change their whole appearance.

Soma is wearing Coralie's skin from NobQueen...otherwise she's got the same hair and eyes (different color) as I used in her original marketing promotions