>>3530624Well, it would be quite extensive to talk about it in general and that always depends on your figure's angle.
Take a look at this pic. Normally you look at the reference first and an untrained eye could see a lot of wavy lines there. But as someone who knows the anatomy of the arm, you know that the large curve on the shoulder is the deltoid. and that tells you where it goes and how far it goes and also where it doesn't go or shouldn't go. Another large curve consists of the radial forearm group and the extensors. Because you can map the observed curves to major muscles you know if they are a significant feature or just the general direction of a limb.
