So, as you can see from the drawing:
balding: The man is losing his hair, but it is not all gone yet.
bald: The man has lost all his hair.
A shaved head means that the man CAN have hair but has decided to shave it off. Many swimmers and other athletes do this...
BE CAREFUL, skinhead meaning having a shaved head is Japanese-English. In normal English, a skinhead is a white supremacist or nazi. So a skinhead is a VERY negative word~!
