What catches a girl's attention, what do girls see / look for in guys?
Guys: Sorry, but we pretty much just want to have sex with you. We look at how physically attractive you are, and may or may not want to have sex with you to varying degrees. The vast majority just want you to be fit, and having a cute face seals the deal. Everything else comes after. So you're a cool person? +1 We get along? +1, etc... until something substantial builds. It all stems from the first part though, at least in my experience. I think it's mostly a biological thing that we don't have much say over.
Girls: Explain? What's the entry fee (the things that must be met before considering attraction)? Face, smile, calves, sense of humor, confidence, height? The male check list is pretty simple and straightforward, the female one seems more complicated.