ugly, deformed, noisy, blurry, distorted, out of focus, bad anatomy, extra limbs, poorly drawn face, poorly drawn hands, missing fingers
Greasy Hair: Silky hair is one thing, but avoid greasy, slicked-back styles that might look comical.
Overly Cheesy Smile: The smirk works because it's subtle. A toothy grin might come across as cheesy or out of character.
Sparkly Eyes: The shine in his eyes can be there, but avoid making them glitter unrealistically.