Yes they still have the lighted mirrors.
There is a hair dryer in the room, but I don't know if it would be strong enough for your hair - it's fine for me because I have short fine hair.
Your cabin will have twin beds, a sofa which is made into a bed at night and an upper bunk.
If you go to HAL's website www.hollandamerica.com
go to "On Board Our Ships", "Deck plans" and then scroll down to Westerdam. There you will see the deck plans and if you click on your cabin # you will see what it looks like.
I really hope it's bigger than it looks because for 4 gals it's going to be cozy.
You don't say what ports you are visiting, so if you list those I am sure there will be someone to help you with excursions.