Bridesmaid Hair

Sorry to say you have no authority over what your bridesmaids do with their hair or that they make use of professionals at all. The deal is this. You can offer to pay for pro hair or makeup or you can provide access to those services if they wish to make use of them, but you can't dictate styles, who they use, or that they can't DIY if that's what they prefer. You get input on the dress. Hair is a personal choice.

Nope, that wouldn’t look odd at all. Bridesmaids should choose hair and makeup that flatters them individually. And tbh, no one is going to be paying attention to your BM’s hair, makeup, shoes, etc., so don’t waste time worrying about those little details. Everyone’s focus will be on you and your spouse

That’s not weird at all. It’s courteous and being mindful that they have individual style to let them wear hair and makeup how they are comfortable.

It’s the more appropriate thing to let them choose their own hairstyle anyway! And my MOH and bridesmaid wanted different hairstyles and I think it looked fine!

Not weird. This is what my girls did. One only ever wears her hair down and the others wanted fancy. Everyone looked great and so do my pictures