Images that have NO to VERY LITTLE image manipulation. For the most part, these photographs come "straight out of the camera." If you have a photograph that contains color corrections, correction for contrast, etc., those photos should be entered into the "Photo Manipulations" album.
The subject matter is primarily photographic in nature. However, a significant part of the photograph was edited or corrected for color & contrast, etc, and/or manipulated using photo editing software like PhotoShop or Gimp.
Artwork that is illustrative in nature; however it is created primarily using a piece of software like PhotoShop or Illustrator. Any form of vector or bitmap imagery can be included here. A piece of work that contains photographs may be included here as well. However the work "goes beyond" being a photograph. It may include a variety of techniques and/or media and has now ventured into the realms of computer generated art.