Bridesmaids hair- matching or different???

Hiya ladies,
Im getting married in August of this year (ahhhhh!!)
and im still undecided about what to do with my bridesmaids hair. I have six grown up bridesmaids and as i have 120 guests coming to the ceremony, i want them to stand out. Im having my hair curly and to the side, with a tiara. My bridesmaids have long black strapless maxi dresses. Should i have their hair down, up, the same/not the same??! so confused 
! Any advice would be muchly appreciated 
Love Vicky xx
Im getting married in August of this year (ahhhhh!!)




Love Vicky xx
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But then mine are completely different, different shoes, accessories, bouquets and dresses, so their hair and make-up won't really matter either lol. x
xxx.
HAHAHA! LOVE THIS!
I was going to let them all have what they wanted, but iv got a couple which are quite "barbie-ish" and didnt want them going too over the top with that look
My junior bridesmaid (9) will have something age approptiate but i want to try and make it similar to the adults so she feels included.