Caption: Dragon’s skeleton sketched by the Yarge naturalist Lh’ook of Migantil, showing the anatomy of the upper and lower shoulders and wing. The spine would rarely be held this straight in life – the artist simplified its posture for clarity.
This will be about 2/3 page width in the finished book, I think it'll look reasonably good at that size.
Much later - to clarify things, here's some clip art I found on line that shows the sort of body form I'm going with. This one doesn't have hind legs, but it's otherwise about the way I envisage them looking.