I only have a few requests for using my stock :-)
1 - Your artwork must be signifigantly different to the original
2 - Credit the copyright owner of the original image (photographer, sometimes model) with their name and a link to their page :-)
3 - Contact me if you want to use it for commercial purposes (this needs to be discussed with the photographer! wouldnt want to get in trouble :s)
4 - Please show me your work! I love seeing great artwork! (just comment on the image with a link to your work)
Thats it! So have fun! :-D