Full-color or black-and-white photography is preferred; limit use of duotones (especially on photos featuring faces) and other stylized coloring techniques.
When it is possible to allow images to bleed, do so.
Do not use body copy on top of images if doing so compromises readability.
Use the appropriate resolution for photos (300 dots per inch for print, 250 dots per inch for newsprint and 72 dots per inch for Web and other on-screen applications).