Give a girl a chance to breath
Just joined and before I had even had a chance to fill out my profile and look around the site, I'm flooded with pictures of dicks, friend requests and chat invites from complete strangers.
I don't know how it works where you come from but here in China you usually try to get know someone first, which means sending a message introducing yourself properly, not a snap of your penis and nothing else- no face.
Give a girl a chance to get to know you, to look around and get a feel for things. Then send something intelligent to catch my attention.