So what if you get your photos back from your photographer and you don't like them?!
1) Take a breath. Relax. Sleep on it.
2) Ask your family/friends what they think.
3) Still not impressed? Identify what specifically you do not like about your photos. Is it fixable (like retouching blemishes, the way the picture is cropped)? Or something we can't edit (weird lighting because of weather, not a flattering outfit)?
4) Talk to your photographer and see if you can work out a solution.