How do artists manage to draw such complicated scenes, objects, people etc.?
By simplifying. Learn the basic forms - Cube, Cylinder, Sphere, Cone. Then you will be able to see through the surfaces and draw the underlying forms. It was a revelation to me, With practise (daily if possible) you
can see these forms everywhere you look and draw even complicated things by simlpifying them down to their basic shapes, their real 3D forms.