If you are doing portrait work, online galleries are notorious for producing LOW sales averages. The best way to not only raise averages but also gauge reaction and emotion is in person consultation. Personally, I have apple TV which communicates with my computer, and i have a large screen HDTV, so I display their pictures large on the wall... They get the feel and the look of what a large print would look on a wall. Others suggest even going projection showing.... Projection with some sales software you could show them exactly how small an 8x10 or 11x14 would look on the wall vs a 20x24 or 30x40... Pays for itself after a few sales, or so i'm told.