Just fixed a usability problem. Lots of visitors complained that when they clicked “download” nothing happened. By reviewing the website, I found that I used an up arrow, and a down arrow for voting for the picture with a positve vote, or a negative vote. However, users misunderstood that, and I don’t blame them!
I switched the icons to a green up thumb, and a down red thumb for voting for a picture. Also, added a disk icon, with an arrow pointing down in the area, which has the different download formats.
Hope this helps and reduces confusion.