You'll get it! Just draw what looks right- like what you would see in real life. Study the drawings of others and watch their playbacks. Find out what it is they're doing that you're not and then do it! Most importantly, PRACTICE. Always add more detail, make it look more real each time you draw. It's okay to experment with new techniques! For a long time I never bothered with pre-sketches and my art suffered. Then I started to try it, and, over time, it helped.