Alejandro's picture of my halloween costume is currently the fifth result for [WARNING: don't click these links if you are squeamish!] "shark attack" and the first result for "shark attack victim" on Google Image Search.
The doodles that I draw in the margins of my class notes are second and third on a search for "geometric designs", but they don't bring in as many visitors.
Finally, my pictures of Champaign's many construction projects are the third and fourth results for "champaign construction", right behind a superb local photoblog.
These results do not necessarily say anything about my website, just that Google likes images with meaningful filenames and descriptive alternate text.