I am not a big proponent of pre and post op photos for breast augmentation. I feel that photos, while very interesting, can be potentially misleading. That being said, all of my breast augment patients want to see them. If you are trying to gain some insight into the skills of the surgeon, there are several things to look for.
One of the most important things to look for is symmetry in the final result. Look carefully at the pre-operative photos and look at how symmetrical or asymmetrical the breasts were before surgery and then look at the result. If the breasts lack symmetry at the start and has reasonable symmetry at the end, I think that this is an important point.
Another point to consider is the amount of ptosis (droop) in the breast. If the patient has some droop to the breast, note if it was corrected with the surgery. While large amounts of droop cannot be fixed with augmentation alone, smaller amounts can be made to look acceptable with good surgical skills.
Look at the placement of the implant as well. Is it placed sqarely behind the nipple and areola? Does the nipple and areola project forward, and not up or down?
Keep in mind most surgeons will show only their best cases, thus it may be hard to gain a lot of knowledge from them. If you see pre-op photos that show breasts of less then ideal anatomies and the results are good, that generally shows a skilled surgeon. If the starting anatomy is good, it is much easier to get a good result.
If you are trying to get an idea of how you will look after surgery from pre- and post- op photos, this is even harder to do. Many of my patients will scour the internet looking for people that have a similar build and similar breast anatomy that received implants of a certain size. While many people are comforted by finding such pictures, the photos still may not be an accurate representation of your particular final outcome. I think a frank discussion with your surgeon concerning the outcome may be more enlightening.