Graphics is probably overkill.
It's comforting to know that, should you ever need to view graphic X, PMView is the most likely to have support for X out of all three programs. On my system, the WarpCenter remains on top of full-screen images, even when the WarpCenter's own 'Keep on Top' option is turned off. PMView and PMJpeg have no such problems, both taking up the entire screen for image display. All three programs also include the ability to 'capture' part of your screen into a picture format of your choice. Each allows you to capture anything from the entire Desktop all the way down to the inner contents of a folder or window.