Outer and inner glows can be pretty (eg. most of my signatures actually have an insane amount of glows). But subtlety is the key, that's why they don't rape your eyes (anymore).
On a small resolution, anything larger than 10 px is overkill. Also, don't push the opacity past the 85% mark. Depending on specific compositions, range and contrast, 65% to 75% (default) is often more than enough.
To alter the range of colours/theme of an image, use gradient overlays (ask me if you want to know more about them).