Rights To Your Pictures

No, you still hold the copyright.

Before joining a site, it's important to read the TOS, FAQs, etc...
"The copyrights in and to all Images You submit remain with You as the owner of such copyrights. Nothing contained herein shall be construed to transfer any copyrights to Fine Art America or its sublicenses."

http://fineartamerica.com/termsofuse.html?document=contributortermsofuse

you hold the rights. but as heather says always read the contracts on each site and totally understand it. not all are that honest.

---Mike Savad

Thank you all

You hold the copyrights always, even after a sale of original work ( you are free to make prints, etc). I do recommend however watermarking your work on all internet sites, and/or let FAA use theirs for you here. Last year I found lots of my work for sale on several other sites, since then I watermark everything!!
Good luck :)