Low poly shoulder problem

Hello! I have problem figuring out how this should part is done correctly…

My goal is also to rig and animate it without crazy glitches…

I cant find proper reference image but i have been trying to figure this out with these.

Would appreciate some help! Thanks!

https://i.gyazo.com/756c656a2ebacb7285e3cb4f7f13167f.png

http://img13.deviantart.net/ed6b/i/2011/121/f/b/low_poly_coach_by_s_h_a_n_k_s-d3fatgb.jpg

https://s-media-cache-ak0.pinimg.com/originals/66/ca/49/66ca49498824de1dbb11133771a0785d.png

Also if moderator could delete my other thread https://blenderartists.org/forum/showthread.php?418447-low-poly-shoulder-problem
Thanks!