When you prepare photographs of your sale item, just take a simple white, grey or black sheet depending on the colour of the item you are selling and drape it in a curve behind the object. Do not have the item too close to the background otherwise you may create difficult shadows that will detract.
Above all, examine your image before you post it and make sure that it is sharp and in focus. There is nothing worse than looking at images of cameras that are for sale and they are out of focus. Clean background and a sharp image = easier sale.
Spend a little time and get a better response aye ?