When I asked my BM's to be in my WP I told them to choose a knee length LBD. For hair I let them know that I would be getting my hair done at the salon where I always go and if they want their hair done professionally to let me know so I can make an appointment for them (I included the cost for a normal wedding updo). They have all decided to get their hair professionally done and I'm letting them choose what style they want. I told them that if they have particular style in mind to bring a photo so the sylist can see it.
Fast forward to a few weeks ago. FSIL (one of my BM) ranted for about 5 minutes about wishing I had just chosen a dress and told her to get it because she's had such trouble finding a dress that's dressy enough for a wedding and she'll still probably only wear it once. In light of this, would it be okay to have photos at the salon on my wedding day of styles I happen to like as options/ideas? If they have something they like they can still do that. I'm hoping to head off any "Tell me how to have her do my hair" I can't afford to pay for their appointments which is why I'm trying to be as open as possible.