About shaved heads for people other than monks...maybe some people did it, but wasn't your hair one of your most precious and respected things? Wasn't one of the reasons many common people protested the Qing haircut (not counting resentment against the foreign government) because your hair is what your parents gave you, and you shouldn't cut it off?
Ok, most Chinese are peasants living below subsistence level. This is the group of people whom I am referring to. They are the neglected backbone of China, even till today. The paintings are mostly of town / city folks. The city dwellers and intellectuals protested against the hair shaving policy, whilst the country folks were pretty docile. To get an idea of what these ancient guys looked like, you can refer to the old photos of the late Qing and Republican period. You can also read Edgar Snow's "Red Star over China". Yes, women are supposed to preserve their modesty, but in Edgar's book, for some very poor folks, things were quite different. This showed how bad life were in the past. Most ancient Chinese were more concerned with food rather than getting yarns of cotton / silk so that the textile could be sewn into gowns that modern period drama serial fantasizes about so frequently.