Can you provide dimensions and simple floorplan of the bathroom - door and window placement, tub/shower placement . . .

Could you do a tower at either end of the vanity so you could still have a lot of counter & mirror in the center?

forget about looking good. it will look fine. It's all about the storage.

Decide what you NEED. separated in the middle is better, so they each have their own space and mirror. storage!!!

current bathroom before remodel but same layout

I would change the cabinet to be a single sink and more drawers.

Growing up I had 2 sisters and the three of us had a vanity a little smaller than this with a single bowl. Only one person needed to brush their teeth at one time and we managed to swap places without argument. There was plenty of space for each of us to be able to do our hair and apply makeup in front of the mirror and plenty of drawer space for all our stuff.

Think about 2 stacks of 3 21" wide drawers and how much stuff that can hold or do 3 stack of 15" drawers

I know having the two sides not symmetrical seems odd, but because we walk through the door and don't see the vanity head on no one notices. I did this in my master and no one notices unless I point it out to them.

Hi. If you are removing the large mirror, consider installing a single, upper cabinet (not a tower sitting on the countertop) on the wall between the sinks. Like a kitchen upper cabinet.

Something similar to this which gives you a bit more storage without sacrificing counter space.

I like Sue's idea to use a wall cabinet. Keep the depth just large enough to house most of your girl's makeup bottles. You could mirror the front of it and have it look like an integral part of the mirror.

A medicine cabinet, recessed or surface mounted, will add a lot of storage. I like Robern and used 24" x 48" cabinets in my master bathroom and 20" x 48" in my guest bathroom.