I just bought a print of this on dictionary paper for $10! Anatomy of the Heart
noel badges pugh on scientific illustration; "go outside and draw from life. bring a magnifying glass."
Vintage French Chart Dinosaurs Zoology Black and White by sandmarg
Avian anatomy illustration by Volcher Coiter
Dynamic Sketching 1
dynamic sketching | Tumblr
Golden Eagle Skull & Horse, Charles Hamel on ArtStation at https://www.artstation.com/artwork/golden-eagle-skull-horse
unbelievable talent from this blog.