Cel

A frame is flat paint plus a line. Build the hero frame of each shot at full opacity before any tween.

Paint

Use only the hexes on the sheet. A highlight is line, moon, or practical. It is not a new hex.

Sky may be a gradient between sky and ink. Characters, cloth, and the blade are flat.
One shadow shape per character, hard-edged, ink at about 20% over the local color. No airbrush, no soft light on skin.
The eye white is sclera. The iris is iris. Pupil is hair or ink. Two catchlights maximum, cut from line or moon, window-shaped.
Hair is two or three masses. Bangs are chunks. One hard sheen band in moon or line. Not strands, not a glow.
Line sits on top. At 1080px tall, outer contour about 6px, interior lines about 3px. Taper by drawing the path, not with a blur filter.