I don't try to make sims that look like anybody I know, or even anybody in particular. I don't have the skills and it doesn't really feel right to me. My sims are their own 'people'. As far as looks, I never plan how they'll look physically. Their look happens free style. It evolves as I sit there and ask myself questions about them, or ask questions and answer how I think they would if they were real and there with me. I will at times have a particular fashion aesthetic in mind when I start, but that's as much planning ahead as I do.