1. Shaving the head means shaving all the hair, usually including the hair on the top of the head, sides and back, so that the head is completely bald, while shaving the eyebrows means shaving part or all of the eyebrows, usually trimming or adjusting the eyebrows.

2. Shaving the head is to shave off all the hair, which has greatly changed the overall image and appearance, while shaving the eyebrows only deals with the eyebrows and has relatively little change to the overall image.