You should be happy you're making anything at all with Adsense. People don't go to your page to buy/click on advertising. They just want to see/download the photos you have on the site. Fastclick or other banner advertisers is your only source of REAL revenue. How much more "dumb" down can your site get if all you have is photos anyway? People will never click on your banners anyway. You're just depending on page impressions to make money. And with over 1 mil a month, you should make plenty of dough. Ditch Adsense completely and go with the obvious choice. Banner advertisers.