If after cropping, your image is still over 500 pixels wide you should consider resizing it smaller. Some cameras will take pictures way over 640 pixels wide and most scanners can make a very wide picture too. If you really want people to view your auctions and see the pictures, keep them between 300 and 500 pixels wide.

Click on IMAGE then RESIZE. ( Not RESAMPLE ).

While we are on this screen note the options for BRIGHTNESS, CONTRAST, GAMMA CORRECTION, COLOR BALANCE and SHARPNESS. These are all good features to become familiar with if you want to really make your pictures look their best. Experiment with them when you are comfortable with the basics we are discussing.