Don’t underestimate the power of proportions, because if your proportions aren’t correct, everything else falls apart. This is also applicable to design. When sketching your character, you should include a variety of big, medium and small shapes. This has many advantages: you can use big shapes to lead the eye towards important areas, allow the design to breathe, and create contrast which in turn generates interest.
Let the shapes you use tell the story, rather than distract the audience from it