Well, I will answer this even though I find it kind of irrelevant as far as who I choose to have relationships with. I have never even had a relationship with someone who would meet these "standards," because I am so much more attracted to
who a person is.
I am "generally" attracted to guys who are very natural looking. I am
not big on the clean cut look or the super-muscular look. Maybe little bit of scruff and longer hair (but those are not that big of a deal). Being healthy is also a non-negotiable for me, which is both physical and mental/emotional. This is funny because it sounds like the male version of my appearance (minus the scruff of course, heh). I prefer to be natural with no make up, comfortable clothes, and I feel that I am very healthy looking.
I'd say the #1 physical thing that attracts me are the way a man uses his eyes. If a stranger can use his eyes to make direct eye contact and create intimacy, I melt
This is tricky though, because it can't be done in a creepy way. I don't know if this counts as physical, because it is reflective of the inside.
I think that when I see a guy who I think is physically attractive, it is more of a "oh, he is cute" attraction. When I meet a guy who is mentally/emotionally attractive, I end up going for that no matter how he looks. From experience, I find that the "sparks" come from that second type of attraction and not so much the physical.