[ I've discovered that, sometimes, a pose that looks good on paper is actually
not possible for the human body !] in this case, I wanted to check that a human
could actually tilt the head that much without toppling off the perch !
It's obviously your and only yours choice.
But if I've learned anything is that you do not need to look for feasibility in Art. That was already so when artists depicted divinities they didn't believe in, or "feats" that were impossible (like the flight of Icarus), or even impossible entities (like fauni and monsters). In my opinion, but that's only my most humble and arguable opinion, if you find a pose that looks good on paper, even if it is impossible (or even more so if it is), that "goodness" is heavier than feasibility (call it an Artist's license).
At one point I didn't have time for "making", so I went on to Photography, which I could capture in a quick snapshot. Or so I thought. I soon discovered that mastering light, illumination, grasping the moment and opportunity, planning... took a lot of effort and that sometimes the setup would take more than a drawing would have. Anyway, I still love Photography, but I went back to drawing and painting just because I saw the limitations of Photography: you are bound by Reality (did I mention I don't like post-processing? I've always been a person of 'alla prima', plus, if I'm gonna post-process a photo to make it look as I want, not as it can be, I feel I'm cheating).
Not to say post-processing is bad. But instead of spending hours to get rid of that nasty detail in a credible way, or waiting for someone to move and clear the way (specially with the proliferation of inconsiderate "influencers" and selfie-hunting tourists) or waiting for the day of the year with the appropriate light (if weather fits), I find it easier and faster to just draw what I "see".
When you "build" it yourself, you can force perspectives, poses, remove or add elements, increase the weight of relevant elements, and decrease those less important, much as you "see" in your mind (you have to try Photography to understand the importance of our brain on distorting the reality we perceive). And it will usually be faster than aiming for fidelity, and work much better.
Not to say you can't get similar effects with raw Photography, but it takes dedication, effort and time, likely more than "building" it by hand yourself.
I think, where I am trying to arrive at, is that -in my most humble opinion- you shouldn't limit yourself by what is feasible: if you "see" something some way in your mind, then, express it as you perceive it, as an Artist, you can take that license.
That is, if you want to, of course. No need to otherwise.
You look to me as very talented, and I'd likely have loved to see those "poses" that looked good on paper to you but discarded.