This is a really cool and creative illustration. If you feel that you're struggling with form then I would recommend just spending some time going over the basics of form and perspective. Boxes, cylinders, cones and spheres and then learn how to manipulate them. The beginner road on ArtWOD is a great place to start. Perspective, form and depth are really all the same thing. Composition flows from an understanding of perspective. Honestly though I think you’ve already got a pretty good handle on all of that. Maybe just a little more focused practice on form and perspective will help give you more confidence. | Artwod Feedback