Great work! I'm actually surprised at how similar our process are! Start off with the skeleton, add a few rulers here and there to help keep proportions as you move forward. Build character with forms, adding muscles and finally start adding the details.
I wasn't sure if that was a good way to go at it, but it seemed to work, and seeing it so clearly used by others is reassuring.
Lineart in general is really tight, clear and well done too!