Just in relation to making your images more professional that the regular generic drop shipping ones, many people actually buy in one of each product they are selling to take their own pics.
Even if you don't do anything more other than upload them, your images will already stand out from the other drop ship images. However if you have a computer graphics like Corel, Photoshop or some other program, you can also ad information to your images to give your listing a magazine like feel.
You don't have to go crazy and completely overdo an image, but a graphics program can really help you bring your images to life, as well as of course as you're whole listing template.
You're really only limited by your own creativity, or that of a good friend :)