Andres, So far no one has mentioned compression. The size of the picture doesn't really matter a whole lot, though if you go above about 12 inches at 72 ppi on the long side some people will have to scroll to see the whole thing. More importantly: when you compress, a file size above 500K isn't going to add anything to the quality of what people see on a 72 ppi monitor, but it's going to slow down the upload considerably. Personally, if I run into a very slow load obviously caused by the poster not reducing file size adequately, I just kill the download and move on.