Maggief,
I'm bald and I describe people as bald all the time. I did it about 3 days ago. I told someone at work - you know the Bald guy that works on the xxx system Software Development.
It's one of most obvious ways to describe someone. Very prominent characteristic.
My grandfather had that little tuft of gray hair on the top of his head and the rest was pretty thin, but I always thought of him as bald, distinguished but bald...just my 2 cents