Well done. Simple enough. Fun to use. I'll probably never use it again, but I'm sure there are many millions of people that would spend a dozen minutes or so on this site. With that kind of traffic, I think you have a good shot of success. My prediction is that the celebrity comparison will be the most popular, followed by the user submissions. It's fun to look at pretty faces. It would be interesting to see the patterns and clusters that develop in your data. That would be very cool if you shared the statistics with the community(or if you ever need a data junky to volunteer an analyze your database shoot me a message). Good luck.