I think it looks better 90 degrees clowise rotated, but it could be because I like the looks of the right upper girl the most. :) You've got some nice portraits of her in your Hamburg stad oper gallery as well.
There is also an interesting (well, interesting, maybe I have been looking to long at these lovely girls) balance of eyebrows. The north and south girls have round flowing ones, while the west and east girls have a hard bend in them. And now that I'm looking at stuff like that, the same balance applies to shirts covering necks or not. Staring into four pair of beautiful eyes at 01.50 in the night makes me a little bit insane I guess.
Great idea, why do I think of The Beatles when I look at this shot? Beautiful girls, great lighting and spot on DOF make this a pleasure to view and vote on. Great job!
the square crop is very fitting here, and i really like how all the women have that similar piercing expresssion. the only thing constructive i can say is the way they are lit. the woman on the top right (notice harsh shadow differences) has a lot less lighting than the girl to the bottom, for example. if all of them had more of a flattering lighting, maybe it would make it more powerful. perhaps using some reflectors to reflect the light where you want it can help. but overall, its a very compelling shot in my opinion :)