Tan lines are very tricky to get rid of in Photoshop. They curve around the shoulders in such a way that it makes the process time consuming. So, I usually will only work on the ones where they are glaringly obvious and important.
There are a few things you can do to avoid tan lines:
There you have it! A few simple things you can do to make your photographer’s life a little bit easier and s/he will love you for it.