Avoid creating a landscape painting that lacks realism or fails to accurately depict the serene sunset, the lake, and the surrounding mountains. Ensure the artwork does not exhibit inaccuracies in the colors of the sky or reflections on the water's surface. Avoid using brushwork and layering techniques that result in a flat or unnatural appearance. Not attention to the intricate details of the mountains, trees, and foliage, capturing their textures and forms accurately. Avoid lighting inconsistencies that diminish the overall atmosphere of tranquility and beauty.