I hope this quick diagram I sketched can be of some help. For the body of the car, you first have to draw a light 3d or 2d box, depending on how your character is facing. Then slowly but surely carve out the character from the box using reference pictures and more lines if needed, like I did with my 2d quick sketch of Finn. (its not my best sketch)
Faces and eyes are easy, you just need to get used to it. Practice mine, then do some other moods on your own, and use references from any of the movies or shorts for help too.