Teacher with board and teaching mathematics

EasyNegative, (verybadimagenegative_v1.3), (missing fingers, missing hands, missing legs:1.4) (extra fingers, extra hands, extra legs:1.4), (mutate fingers, mutated hands, mutated legs:1.4), (blurry, depth of field:2.0), (poorly drawn hands, poorly drawn face:1.4), signature, watermark