Im not a professional seller LOL But I have sold a few things.
As far as pictures:
I use photobucket to host my pictures. I actually create a big layout of many pictures using Photoshop, then upload that to Photobucket. Then use the html code within the auction!
So, I would recommend using Photobucket. Its free!
I also have a set TOA that I created in Photoshop and uploaded into Photobucket. So I just had that code to ever auction.