Hair, if the text feels slight to you, you're probably looking at a magazine piece (though I must say some of the best magazine pieces are not in the least bit slight; in contrast some PBs fall in that category but I'm not naming names). A PB has to have weight for repeated readings, a surprise or emotion that wells up and overflows. And of course, Ev mentioned the most important point--does it have enough different picturable scenes for a PB.
To get a better feel for the magazines, pick up Highlights or Cricket or Jack-n-Jill, whatever is available at your library.