Anatomy study - Shoulders (Patreon)

Technically speaking it's my first time trying to put my anatomy knowledge in a form which others could learn from, so I'm very open for your feed backs! 

I split this study into boring actual bones & muscles study (without names cuz no way anyone will remember them anyway), simple DO's & DON'T's and a short freehand page where I just try my best to show how to simplify the process of drawing shoulders, cuz let's be honest... shoulders are really hard...