I shaved my head for a few months, and was clean shaven too. But aside from my eyebrows, I thought "something was missing."
At first I grew out a long goatee, redneck style. Tried growing the bottom as long as possible and kept the top groomed....being accused of looking like a skin head, I was told by many (girls mainly) that I should trim it short. I didn't want to because EVERY guy, shaved/bald or any combination thereof had that. Reason why, is because it works! And you need something to break up having "too much skin." Some grow facial hair, some have diamond earrings, some both...but in my experience the main reason is because it's to take your eyes of having all that skin and being "too monotonous."