http://www.sxc.hu/
This is a royalty free photo site it is easy to upload your images all you do is sign up which is free the limitation is you use them as you like but you can not make any money from there use. you should also ask the owners permission before using them. you can not get any money for your images on this site . But you can also sell your work here for $1 up to as much as you like.you can buy them as well from its sister site
http://www.istockphoto.com
http://gimp-savvy.com/PHOTO-ARCHIVE/
this is a copyright free site you can not make any money on this site
restrictions
The images and photos found in this archive come from three main sources: the National Aeronautics and Space Administration (NASA), the National Oceanic and Atmospheric Administration (NOAA), and the U.S. Fish and Wildlife Service (FWS). Each of these sites clearly state that their photos and images are in the public domain and give the conditions for their use. Please read their statements.
The photos you’ll find here are copyright free, but some restrictions still apply. Specifically, people have a legal right to privacy, and the use of their likeness for commercial advertising typically requires a consent agreement. If a person is recognizable in an image, a model release must be obtained before using the image for commercial purposes.
In principle, if an photo is sufficiently modified so that individuals are no longer “recognizable”, it should be okay to use. In any and all cases, the final responsibility for the fair use of the images found on this site is yours. The advice you are reading here is not a qualified legal opinion. You should seek legal advice if you have any questions or doubts about your use of images containing recognizable individuals.
Finally, as stated on the web sites of NASA, the NOAA, and the FWS, the use of these agencies’ official emblems to implicitly or explicitly endorse any product, organization, policy, or agenda is strictly prohibited by law.
Acceptable Site Use Policy
Because Gimp-Savvy.com is built on limited resources, you are requested to refrain from trying to automatically download the entire image archive collection. The available bandwidth just would not permit such an activity. If you have a hankering for your own image archive you can easily create one by following the instructions given in the section entitled Sources of Raw Image Materials in Grokking the GIMP.