Here is one of the most comment problem I see on beginner sketches. You can really change the feeling of your design sketch a lot by adding this easy trick.

If you want to learn car design;
My Online Courses;

Free Car Design 101 Course ; https://gum.co/xCeUi
Full Car Design 101 Course ; https://gumroad.com/l/bnkgN
Free Photoshop Brushes ; https://gumroad.com/l/epKea
Photoshop for Car Design Course ; https://gumroad.com/l/FUmDx
Blender 3D for Car Design (for beginners) Course; https://gum.co/bQtHg

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See you in the next video :)