Post a pic! I've got mine posted, so I expect you fellas to do the same. And make it a recent one. Also, when writing, make it known that you actually read her profile. Do NOT send a canned email that could have easily been written to a million other women. Be funny! If you can make me smile, that's half the battle. If you send her an email and she doesn't respond within the first 24 hours, don't send a follow up asking if your initial email went through. Even if it shows she's read it or has been online, it doesn't mean she's in the mood to respond right away. I'll be the first to admit that if I'm not interested, I simply do not respond. It happens. I get paid back when I write guys and they don't respond. It's just typical of the online dating world.
But really .... just be yourself and be honest. Don't try to fake common interests just because you happen to like her photo!