Remove any visual defects in a piece of pixel art, such as jagged edges, incorrect color choices, or inconsistencies in pixel placement. Ensure that all lines are smooth and crisp, and that the color palette is appropriate for the piece. Correct any issues with proportion, such as misshapen or mismatched features, and ensure that the overall composition is balanced and aesthetically pleasing. The final result should be a clean and polished piece of pixel art, that accurately captures the intended style and represents the artist's vision.