SHE (still) WANTS THE 3D

[Sketchasaurus]

And really, part of it too is building muscle memory and being able to feel around a drawing confidently and competently. and a sketch line isn't even a final line anyways. Anatomy really doesn't have to be a difficult thing, considering we see other humans amongst us practically every single day.

Also "style" is almost never a valid justification as far as I'm concerned (I'm sure I've said something to that effect in general countless times, but it bears repeating, I suppose) And really, license to stylize comes after a certain level of understanding is achieved (though this is subjective) But the amount of practice (or lack thereof) will be apparent in one's work and hinder the appeal. It's more obvious, and distracting, when something looks "off" than when something looks "right" But it's also important to train your eye in addition to your hand when drawing.
Heck, you don't have to go deep into the anatomical study or know which muscle the sternocleidomastoid is (hint: it's the muscle that attaches from the collar bone region to the base of the skull) but knowing the major shapes that the bones and muscles make will only help you in the long run. In essence, it all ties in with the quote I keep in my signature by good ol' Salvador Dali, who is known for his very stylized works. But I'll include it in my post:

Begin by learning to draw and paint like the old masters. After that, you can do as you like; everyone will respect you.