You dont have to do this, but u could try to pick features that reflect your characters traits. Theres some general-albeit stereotypical- physical traits you can choose from.
Blonde=pretty, maybe dumb (me, lol)
Brunette=intelligent
Black= idk, musterious, goth emo?
Pale= hates outside/labor or loves indoor activities
Tan= opposite
Eyes? Maybe whatever you want. Try researching color theory.
This is just off the top of my blonde head. Dont have to follow stereo-archetypical traits, it's just what i start with, then change up what i want to reflect- or contrast. Gothic boy loves dolls, with pink eyes? Imaginative!
Idk, your choice. I got no prefs, except i like em soft and round(not so muscley, lol!)