I agree with not "amputating" a limb at a joint. I also agree with cropping the top of the head off when shooting a head shot in which you are trying to "get in close" to capture that facial expression so you fill the frame with the face as much as possible so the viewer can better see all the nuances which make up an expression: a larger face and missing top hairline works to emphasize expression. I don't much like when you are seeing the upper body and part of that head is still cut off, like a waist up shot including both arms folded in front of the body but the top of the head still cropped off as in a head shot. As I see it you crop the top of the head, or hat, off so that you can better fill the frame with the subjects expression. However, this reason doesn't really apply when you are doing a waist up shot as you don't really gain any significant increase in the size of the face when you cut the top of the head off. Every time I frame a waist up portrait and happen to cut off the top of the head I find an invisible force forcing my hand up. What are are your thoughts? Anyone else have trouble cropping off the top of the head when doing a waist up portrait?