I always pick the same look because I really want the dream persona to be tempting for me. So I go for a look I find appealing. I'll try to grab a screenshot some time for this thread.

But it's an easy look. It's the default female elf. The only changes I make are:

Eyes: grey
Hair: 5 (down two from the default)
Hair: Black Raven, no highlights
Makeup: 2