Don't draw Master Yoda with extra arms or legs, no hair or beard, or a very large nose. Avoid that the image has two or more copies of Master Yoda, or that he is superimposed on another character. No blurry, smudged or pixelated images. Don't use colors that are too light or dark, or that don't match the theme of the image., ugly, deformed, noisy, blurry, distorted, grainy