You can go to the following website and check out the exact types of photos that are being used today for actors:
http://www.bradbuckman.com
You should have your photographer take those type of photos.
You should have two good color headshots (not "retouched", unless only to clean up a loose hair, etc), one "serious" and one "smiling". But it doesn't hurt to have 3-4 "looks". Try to portray the best possible image of your "brand". In other words, the type of personality and look that you would best portray. Sometimes it is best to ask several other people who know you, like teachers, friends, classmates, etc. Sometimes beginning actors do not see themself as portraying the "type" that they really should be. Here are some of the primary "types" for young actors:
Young Females:
awkward/gawky
artist
brain
bully
girl-next-door
ingénue/innocent muse
jock
princess
trendsetter
Young Males:
bad boy
boy-next-door
brain
bully
jock
nerdy kid/future genius
paste-eater/super uncool
quirky/trendy
smart-ass
You should also put your name on the bottom of the photo either in a margin, or directly on the photo. Both the photo and resume should be exactly 8x10" and stapled back-to-back on all four corners. Get the original 8x10 prints from the photographer, then have that duplicated.
Here is a great photo duplicating service that offers service through mail:
http://www.argentum.com/2004/index.php