Wanted to draw the same thing from different angles. Here it is:

interesting work - though i'd say that i have a problem with the legs on both of the figures. in the one lower down, the "relationality" between the two seems rather flat - a continuation of the same plateau (i.e plane) through the waist And the legs that seems a bit disconcerting.
As well as the head on the lower one, seems to be relatively out of proportion.

The one higher up seems to just have problems with the mode of shading on her legs -
other than that- my usual ranting on the anime style of drawing sketches etc and the over defined jaw line that was made.

But i must say, this is very impressive in terms of a perspective study.
Great effort. Would be lovely to see some more pieces on perspective,
for their educational value as well as their execution.

About the legs, I intentionally put em straight, originally the legs weren't in the plan. However about the head on the lower version one, you are right about that. I have gone straight up from the forehead whereas I should have gone laid back from the forehead.

Thanks for the critique, I knew something was wrong but I got a flash about the wrongness from your post.