Check out this quick tip from international educator Melissa Garcia for erasing visible fill...
Nail Art Tutorial: Mermaid Dreams
4. Draw the body of the mermaid with a light beige nail polish on the middle finger.
5. Draw the mermaid's hair with a yellow nail polish.
6. Draw the fin of the mermaid with a green nail polish on the middle and ring fingers.
7. Shade the tip of the fin with a light green nail polish.