How do you get your photo to stay up on facebook? Mime will show up and the be gone a few minutes later.
Are you posting to your own Facebook account, or the ArtWanted.com Facebook page?
We are not aware of anything that automatically deletes photos, so they are either there but you can't find them, or someone manually deleted them.
There is a dropdown menu in the Higlights section in the centre of the page. Try there. Click posts by others.