To improve the flying car design, focus on refining the shape for better aerodynamics with smooth curves and minimal edges. The prototype could benefit from incorporating more materials, such as transparent sheets for openings to give a clearer view of the interior, and different types of materials for the electrical components to enhance realism. Using a contrasting color for the moving parts would help highlight their functionality. Additionally, consider exploring alternative methods to connect cardboard pieces without relying too heavily on tape, which can detract from the design's overall quality. Nevertheless, it's a solid prototype to start with and a great foundation for further development.

Concept, sketching are well done. Prototyping could be better!