TIP: Make a second Window

When you're retouching images it can be very useful to use 2 windows: one that you zoom in on to do the work and the other in "actual size" to see the results of the work you're doing. To do this, go to the Window menu and choose Arrange>New Window for "document name". Arrange the 2 windows and as you work in the zoomed in view you'll see the changes made in "actual size" in the second window. One of the reasons I recommend this is otherwise you might end up spending a lot of time zoomed in and fixing a small blemish that isn't even visible in actual size view.