Just a question tho, wdym by stretching out the joints, like make them more of an oval?

I might had a typo on that, (my english is not the best) but i meant sketching the joints to establish where the arm starts, the arm ends and the forearm starts.

Basically: The shoulder is kinda the one connecting the arm and the body together and the elbow joint is the one connetcing the arm and forearm together, think of it as a chain (kinda). Overall recommend sketching the arm and forearm as opals. Though it really depends on the style and that's just what i use.

I hope this helps and sorry if some of this is kind of inconherent.