Hahahaha, I think the reason 3/4 view is so appealing is because the facial structure is much more visible in that angle, and much easier to define. Its easier to define the brow ridge, the cheekbones, and the nose as well as the contour of the jaw. In front view its all so .... flat and chunky. ;( This is also people take selfies in 3/4 view. It is a much more pleasing angle to view.
This is so awesome! Probably the best head turn-around I have seen. A lot of the others I have been looking at have problems such as being vague on certain details (like the nose on a looking-up angle) or the character looks completely different at each angle. Your has none of these problems, everything is very clear.
I don't know how times people asked if they can use this and you got use to it by now, but this is out of courtesy. So, may I use this as reference, please? I mean... I am horrible at trying to draw a person's head in an angle whether they look up or down!