How do one draws upside down? The entire theory that availables seems to work only halves the angles.
>Also
Since realism has like reflection,refraction, how do one plan, realistically, all those values, colors, (maybe also(shapes)) in a picture?
Like those of classical painters, impressionists like mone, Sargent, or just, straight up hyperrealistic. It's kinda complicated how light bounce around and I, have not found much satisfying examples, or mathematically detailed, satisfying, and also correct, practice of the subject.