① A new layer is made above the base color layer, and a pupil is drawn in the center of the eye.
② Contrast is added by applying the [Layer Property]’s [Edge] effect to the layer with the pupil.
③ Making a new layer below the pupil and using the [Soft] brush, shadows are added with a color that is a little darker than the base color(A).
Shadows are added with the same color as the line art of the eye(B), and a color that is lighter than the base color is added to the bottom of the eye(C).
④ A new layer is made above the line art layer, and highlights are added with the [G-pen]. In the “Eye” folder layer, a new layer with its blend mode set to [Add (Glow)] is made, and highlights are added to the inside of the eye with [Opaque watercolor].
⑤ The shadow borders painted in ③-B are blurred with the [Brush] tool →[India ink]→[Lighter ink], and detailed highlights are added to make the eyes sparkle. I used my custom brush [Droplet 2] for the highlights.
The highlight layer’s blending mode is changed to [Glow dodge]. The image will feel flat if all colors are similar, so colors other than the eye color like green and blue are added as highlights.
⑥ To add volume, reflected lights are added to the darker parts of the shadows, and a pale blur is added to the top of the eyes.
⑦ The line art of the eye is adjusted. A new layer is made and clipped to the line art of the eye.
With [Soft], saturated pinks are added to the tips of the eyelashes.
Saturated pinks are also added to the inside of the eyelashes on a new layer.
⑧ Finally, the layers are blended by adjusting their transparency.