ugly, deformed, noisy, blurry, distorted, out of focus, bad anatomy, extra limbs, poorly drawn face, poorly drawn hands, missing fingers, nudity, nude.
The Pixar-style illustration of the mathematics professor should steer clear of deformities, extra limbs, poorly drawn faces or hands, and any lack of focus or excessive blurriness. It's essential to maintain a professional and appropriate image, avoiding any form of nudity or inappropriate content in the visual representation. Additionally, the professor's design should feature short hair and a neatly trimmed beard, rather than long hair or a very thick beard.