>>7638191
huh?
>>7638206
even if you know perspective perfectly you still won't be able to draw a human body in perspective, you need to know anatomy too
But to answer your question more directly there's a few mental shortucts, generally the more things move away from the center of the page the more they will turn away, perspective doesnt actually make things turn but it looks so much like turning you might as well just do that
Also a little goes a long way with perspective, i think most drawings are pretty much orthographic projection anyway. Generally proper perspective is really limiting so most extreme perspective drawings are smoke and mirrors and whatever "feels right"