Limit the number of requests per IP
It makes sense to suppose that one must find a model really hot and interesting to want to go to a website like this and look for her. At any rate, earnest requests are probably the ones worth respecting and responding to. And they are likely to focus the spotlight on models who really stand out from the crowd in more than one person's opinion because they are beautiful, smart, energetic, weird, whatever. It's models like that who deserve to be found. So, trim out idlers who kinda sorta would like to know who this girl is, before they forget. Now, because earnest requests are going to be few, and everyone else is a spammer, why not limit the number allowed per IP address per day? 1 request per 12 or 24 hours seems reasonable. This should cut down on the number of spammers and posters of bland shit you can find anywhere.