BigOne has a good point...there's not a lot of searchable content on the site to get you higher in the rankings...unless you put good metatags in the code of your image descriptions.
How do can I? I tried more other placements, but never ever got up to 1.5% of CTR. 1.5% could be made me happy here.
Yah, I have seen your site,But i think you should add something exclusive which will help to catch peoples attention.
Your click though rate is very low. I have 2 suggestions: 1) Use the leaderboard ad unit as it goes across the page. Position this somewhere near the top. 2) Also add some written content to your website as it is full of images. You can then blend the ad units between paragraphs.