They don't send out checks anymore, so set up a Pay Pal account and fill out all the relevant information Behind the Scenes if you have not already. Like others said, it's not easy to sell here, but it can be done. Don't give up your day job just yet though. I'd guess those that make a living solely off of selling their photographs are few and far between, but it can generate some nice on the side dollars.
By the way, I dig this shot. Dare I say, it's very moooving!