Follow the action across panels
Check whether the sequence explains who moves, where they go, and what changes. A striking panel contributes less when its relation to the next image is unclear.
Inspect economy
Ask which marks communicate depth, pose, and direction quickly. A few decisive lines can give more useful planning information than elaborate surface rendering.
Test a rough version
Reduce a panel to simple shapes and arrows where needed. Compare what information survives and what was only ornamental.