Credit me - you can link back to my profile, to the photo you used, or just mention my name.
Give me a link to the piece you used my stock in. You can do this by note or by a journal comment.
You must have done a significant change to your piece - don't just change the color and call it your work.
They are not to be used as part of a trademark, service mark or logo.
They are free to use except for commercial use.