A handsome face, definitely. I don't have a full head of hair and it has never been an impediment to someone finding me attractive. A large penis, even though I have one, only a very few people in this world have experienced it, so that is really pretty minor. A great physique? I do OK for 50 and stay fit (i.e., very little fat), but an impressive chest and stomach, no. Still, clothes hang good on me, and that's how most people see me. An attractive face is visible to everyone, all the time, and is the light of who you are.
I once had a very serious affair with a lady that had a very average body, but she was beautiful with the most amazing hair. Seeing that lovely face below me as we made love with that thick, incredible hair spread out on the pillow encompassing her face was incredibly erotic. It was every bit as sexy as the best tits I've ever been with (my current lover).