.
Instagram: www.instagram.com/pelayo3d/
.
Full skeleton bone study
I've used many references, but the ones I used the most comes from the books Artistic anatomy by Paul Richer, Anatomy for the artist By Sarah Simblet and the ecorche by the great Rafa Souza.

You can get the low poly version here:
https://www.artstation.com/a/4594314