Lookin good, the feel of the form is emerging nicely.
that pattern of cross-hatching you're developing on the right lat could be a way to go, but I want to caution you. One of your strengths I've seen in your other anatomy studies is your economy of line, and your senstivity to line. The latter has you choosing placement of lines subtly weighted so as to activate the space between the lines, really give them the feeling of form in space; and your economy gives an over-all pleasing sense of airy light to your drawings.
the cross-hatching technique you're starting here seems always to demand more of iteslf. Having been introduced in one part of the drawing, it'll insist on representation elsewhere. While I'm sure you could handle it, it'll mean spending ALOT more time on each drawing,as you've probably found in just the lat area you developed. There is a risk in the end of a "mechanical" look to your drawing, on the other hand, if you take the cross-hatching too far.
And your previous, open style is so lovely!
If you decided to try the cross hatch because of my previous post, I should clarify. What I meant by "hatching" is more properly called "feathering", a technique of building shadows by layering lines put down more or less parallel to each other, instead of crossing each other. This technique is especially good for rendering contiuosly curving, egg-like forms like you find comprising the human figure. It's great whether your final work will be linear, or whether you intend to blend the lines into a single mass, as with pastel, charcoal, or conte. Even after the lines blend into the single mass, the sense of roundness remains. When you're putting down the lines, it helps to imagine you're actually drawing on the subject itself, that you're just letting yourself follow the actual roundness of forms you see on the figure, or the egg. I've got this sketch I did this morning to try to illustrate. But one more word; if you're enjoying the cross-hatching, GO FOR IT, don't let anybody tell you NOT to try something.