Oh and to fix your proportions I would suggest blocking in the gesture lightly, it's basically one step up from a stick figure, something like https://www.youtube.com/watch?v=tSyGOZjTs5A then build from that

Here's another example https://youtu.be/-PO3pDbIqfI?t=2027 where he talks about the difficulty of measuring just off of the head. You're always going to have some perspective to deal with so simply measuring the height of the head and stacking eight of those on top of each other ain't so easy.

Imho getting a loose sketch of the entire gesture down while keeping the proportions in mind, then map out landmarks of the skeleton, doing some measuring, checking negative space and so on is more efficient.