I have a roundish face due to being half Polynesian. Lately I've been doing a low-GI diet (very little pasta, rice, bread, sugar) and my face is slowly getting more angular, like it used to be when I was in my 20s. I'm also doing a mild though regular weight routine at home, which is mainly upper-body focused (shoulders and biceps). I think it's possible to tone-up without bulking up. That is my goal, anyway.
I think you have to maximise your potential, period. So what if more chicks dig thinner, chiseled faces? That's a good enough reason for me to put in the extra effort and/or make minor lifestyle changes. We groom and wear clothes, for example, to impress women when going out...this is fundamental seduction technique.
What's the difference? We are here reading this website because we have all decided to close the pick-up skills gap. If your goal in all this isn't to ultimately impress women, then why are you here?
Be the best you that you can be, and the world will worship you.