Beware of any online "gallery" offering to sell your work.. read the fine print.. many times, if not, you will find that YOU will be SOLELY RESPONSIBLE for shipping and handling to AND FROM it's destination(should they, the customer, choose to return said piece(s) of artwork). Also be aware of any contractual agreements releasing them(or any "gallery" for that matter) of all responsibility or liability of damaged work. These kinds of "arrangements" create a nasty gray area leaving you stuck with the bill(doubled, if returned) and quite possibly with some damaged work(Always request and REQUIRE INSURANCE). Be sure these charges are reflected in your prices. You will find that for these said "galleries" taking their substantial commissions their responsibilities are minimal if ANY. Getting your work exposed online these days does not require much effort or money.. most times you will be doing the foot work yourself anyway, ie. uploading,self-promotion,checking to be sure they haven't made any typos or price changes.. SO WHY ARE THEY BEING COMMISSIONED???? Your work provides the product that brings THEM traffic.. they should be paying YOU! Just a few words to help you on your Journey.. Be Aware of their responsibilities or lack there of! Good Luck!