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as far as I know Skin Colour changes nothing. But I could be wrong. I have only played three characters so far. And they all charged skin colour with me. But everything else you said makes a difference in who does and doesn’t find you attractive going based on looks only. Before they know your personality. But I don’t imagine this game maker, making characters be racist. Or if they did, it would probably be optional to block it. So I doubt it’s in there. 

Other than what NPCs find attractive (which is randomly generated per NPC; there's nothing considered objectively attractive), the only ones that have mechanical effect are height and body type. Height affects Physicality stat and body type affects both Physicality and Athleticism.