So I have only been at this for a few months and with only a few downloads and not even a single level 2 image.
I just got my first Tiff download of a heavily modified image of a lightning picture I took in 2009. I took the picture while sitting in the back of ford explorer with my camera pointing towards an incoming lightning storm, taking bulb exposures nearly the entire time to get as many lighting strikes as possible. I processed the image and decided to make it a secondary color (Green) just because.
While I was taking these bulb exposures a car happened to go by while I was on the side of a gravel road so I got just a streak of brake and front headlights. This turned out to be a great seller as well.
again with heavy processing to get rid of the extra stuff and to solely focus on the lights and road.