Uneven spacing between heads and body copy, or between paragraphs, can be distracting to a reader. Subheads and short summaries or lead-ins can provide a transition between headlines and body copy. Subheads also break up body text into sections, and identify the subject of those sections. Lift paragraphs consist of text pulled from the body copy and placed in a screened box or between rules, usually in a font heavier or otherwise distinct from the body type, to break up a gray page. Do eliminate widows and orphans.
Widows are very short lines, one or two words, at the bottom of a paragraph.
Orphans are short lines at the top of a column. Usually minor editing, adding or cutting a few words will eliminate the line or pad it out to almost full column width. Do use clipart and other graphics to brighten up your pages, but don t go crazy with such art. The old too much of a good thing adage definitely applies here. You also want to be consistent with your art.