Collaborative Online Art Gallery

I wish to create an online Art Gallery composed of artists from all over the country. I wish to give emerging artist an opportunity to sell their art online.? I wish to mimic [[login to view URL]][1]? but with slight improvements on the buyer side.? I wish to make the search easier. The project has to be SEO friendly with inteligent URLs, so that the artist can use it as his online portfolio.? urls like : [login to view URL] The search will include : theme, colors, style, media, size, artist, others There will be an "artist profile" with the artist's artwork and info. The paintings will be sold online, using paypal's API (I will be transfering to the brazilian version of paypal)? and the money will be escrowed to the artist minus a percentage fee.? I wish to let all financial functions administrable through the user interface.? I want to escrow the funds for the buyer, and I want to release the funds when work is completed.? Much similar to RAC. I will translate everything to brazilian portuguese later on, so the software will have to be compatibe with brazilian portuguese. I want the work to be mainly on funcionality and not on design.? I will have to change the design because of language barriers.? So please, do not focus your cost on design. Any questions please let me know. Any insights will be considered a plus.