I actually disagree with that...I think I've said this before somewhere, but a head tilt and exposing more neck increases the sexiness and erotic appeal of the model than if it was straight. It's all to do with body language!
A straight neck is not as interesting and as sexy. Plus, with her head tilt you get to see more of her flowing hair, which you would not see as much of with a straight neck.
Would a better photographer really have directed her to a straight neck too? Surely it would be the other way around and the photographer would have prompted her to tilt her head as per the "Body Language" element. That's probably why there is a picture in that set of her with a tilted head rather than straight as the latter got left out
We all know only a small percentage of a photographers photos taken at a shoot make the final set
Coming back to it #2237 gets