Abdelilah, thanks for the explanation and now I understand what the reference is all about. The reason if someone where to click on a persons artwork who may not be a member and you are sponsoring their photo your image will appear on the sidebar (or called Avatar) because you uploaded their photo to your account. You can indicate who's the image is by and that would be including all of their information in the photographer notes. Also, I am not certain if you could include their personal link directly. The images appear on your created gallery In order for that to work they would have to have an account in their name etc. Personally speaking I think you are doing a great service for those particular artist and photographers you are sponsoring. But keep in mind any sales would be generated to your personal account and then you would be responsible to transfer money personally to those individuals. I think this is what your reference is concerning and why perhaps their image or bio or photo Avatar would not appear and your image does.
What I might suggest is retrieve their images sponsor them on your account and act as gallery owner and give them the sales from potential buyers. You can upload their works include the information in the artist or photographer notes. Understand Abbie or JC moderators would be the ones to make this know too. To what degree this would pose any type of legal sponsorship here at Fine Art America would be solely Fine Art America's decision. I look at your are the Gallery Owner and you are selling your clients works, if you made agreements with your friends or not you might want a commission or not that is your preference, but otherwise I think you are offering your friends opportunity to have their work introduced especially here at Fine Art America its the best a website can be.
I would if you have not done so already in your own personal bio notes include exactly your intentions this may personal be something potential buyers etc might find interesting. Bravo to you and best of success with your personal sales and your sponsored images as well.
Something else I just thought of why not create the gallerys and use their photos attached to their gallery this way if a potential buyer looks in your gallery they will see the individuals you are hosting and or use one of their images as the gallery photo and give each gallery the name of the artist or photographer you are hosting are featuring within your personal Fine Art America gallery page.
It is your personal account and how you arrange your gallery is yours to design as you deem necessary. Anything which is in legal realms here at Fine Art America is exactly the mission Sean the creator and CEO of the company likes to see the success of our well being and of course his mission to provide outstanding pieces of art and photography world wide, and now with all the new features on your personal artistwebsite and Pixels the options are endless.
Cheers, Michael Hoard Principal Actor, Artist and Photographer