When you are working on a photo (either for making a selection or doing some editing), work in full screen. This prevents other windows, menu bars, desktop backgrounds from distracting you. Working in full screen mode changes how you perceive the image. This is especially true if there is a big clash between the colours of your image and that of your desktop. Your image needs space around it. This is also something to keep in mind when you display your photos somewhere.
Happy shooting.
