Really, it's a must to have seen your girl with shorthair before marriage, you never know when they'll turn, so you best know what to expect.
Normally I'm not such a fan of girls with short hair, but like previously stated, a girl with the right face can pull it off.
Then ofcourse it also depends on how it's styled, I can't deal with highlights/colors and mohawks cause I'm having a midlife crisis kinda deal.