Can anyone please give any tips to improve three or four lights setup depending on model's face type (round, oval, triangular, heart-shaped, etc) or face features (blemishes, wrinkles, etc)?

Especially at the moment I have difficulties making headhots of people who has triangular face type. It's obvious for me that Back Light deforms the face by highlighting one of the model's cheek and by leaving opposite one in the shadow (in the deep shadow without Fill Light). But I think getting rid of Back Light will not completely solve the problem.

Maybe there are any good recommendation lists on common portrait/headshot mistakes and solutions to them?

Thanks