Many people note that that they take several photos, to get just a couple of "keepers" that are worth sharing.
One key to taking good photos is to look your best, but even then, some little things can ruin an other wise good shot. I'll rattle off a few and hopefully others will chime in to share some good tips.
I found that a lens level with my face or higher is more flatterin than one that shoots up at me.
I try not ot square off my shoulders toward the camera as this shows how wide they are.
I try ot rememeber to turn my hands to the side or at least keep all my fingers together to keep them small.