Besides making sure your images are in the right color mode, installing the right color profiles for your printer and paper, and calibrating your monitor—are you exhausted yet?—you also need to make sure your image's size matches the size you want to print. For example, if you want to print your image at 5"x7", it should really be 5"x7" (as opposed to, say, taking a 6"x8" image and cramming it into that smaller format). You also need to make sure your image has sufficient resolution (see the table on Resolution guidelines for print for resolution guidelines). Finally, you need to save your image in a file format that works well with your printer.