Bald can be a Photographers Nightmare!
I was invited to shoot a wedding in the off shoot of Hurricane Ivan.
The advice I want to give is very simple. Make sure if the groom (or anyone at the wedding) is bald, that they have a background to their head.
Whether it is trees, a brick wall, it doesn't matter. If the gentleman is bald and it is a cloudy day, his head can be lost in the back ground.
Both making it look like his head is never ending, and can destroy an otherwise fantastic image.
It may seem like silly advice, but TRUST ME! I learned the hard way but was fortunate to catch it in the shoot instead of when the wedding was over.