Draw what you see, not what you think what you see, is probably a recommendation that you've heard a lot if you're a beginner artist, but it can be harder than it might sound. It also raises questions of semantics. You might think you're already trying to draw what you see but you're really only looking rather than seeing.
This is because as well as learning to draw, we need to learn to see. That is, to really notice the details in the objects we're looking at and to avoid being influenced by our existing notions of what they should look like and our simplified, abstract symbolic idea of their appearance.
