You have to learn to see. The information is there in life…but you have to hit it acutely, if you wish your drawing to be a reasonably accurate representation of what ever it is your drawing. If you don’t do that, two things happen. One your drawing doesn’t really look like what you’re seeing. Two…your work becomes stylized. Now that may not be a bad thing. Sometimes a representation of something is more truthful in some ways, than a slavish attempt to represent it faithfully. A lot of times that produces over worked, dead looking art. But in a masters hands, some times, more is more…better…and stunningly beautiful. In a lot of ways, I prefer style over naturalistic drawing. But not forced style. Style is like your handwriting. You just do it. Like handwriting, yours can be terrible, or beautiful. But it will be yours. Where you choose to take it, will in the end be up to you. If anyone likes it, that will be up to the viewer. The best advice I ever heard about drawing was follow the form. If you do that accurately, the likeness will take care of itself. It can be no other way.