There is a blackboard on the wall in a classroom

whiteboard,

verybadimagenegative_v1.3, ng_deepnegative_v1_75t, (ugly face:0.8),cross-eyed,sketches, (worst quality:2), (low quality:2), (normal quality:2), lowres, normal quality, ((monochrome)), ((grayscale)), skin spots, acnes, skin blemishes, bad anatomy, DeepNegative, facing away, tilted head, {Multiple people}, lowres, bad anatomy, bad hands, text, error, missing fingers, extra digit, fewer digits, cropped, worstquality, low quality, normal quality, jpegartifacts, signature, watermark, username, blurry, bad feet, cropped, poorly drawn hands, poorly drawn face, mutation, deformed, worst quality, low quality, normal quality, jpeg artifacts, signature, watermark, extra fingers, fewer digits, extra limbs, extra arms,extra legs, malformed limbs, fused fingers, too many fingers, long neck, cross-eyed,mutated hands, polar lowres, bad body, bad proportions, gross proportions, text, error, missing fingers, missing arms, missing legs, extra digit, extra arms, extra leg, extra foot, ((repeating hair)), artist name, stamp, title, subtitle, date, footer, header, multipul angle, two shot, split view, grid view, low quality, worst quality, out of focus, ugly, error, lowers, blurry, bokeh, disfigured, cloned face, out of frame, dehydrated, morbid, mutilated, earring, earring hole, acne, pimples, rough skin, blemishes, freckles, dullness, sagging, wrinkles, pores, dryness, blackheads, unwanted hair, (anatomically incorrect hands:2), ((anatomically incorrect fingers:2)), (anatomically incorrect nails:2), ((anatomically incorrect number of fingers:2)), ((anatomically incorrect finger joints:2)), ((number of anatomically incorrect finger joints:2)), ((anatomically incorrect finger bones:2)), ((anatomically incorrect finger length:2)), piercing hole, mole, freckles, embeddings, bad_prompt_version2, ng_deepnegative_v1_75t, verybadimagenegative_v1.3, bad-image-v2-39000, EasyNegative, bad-hands-5, bad_prompt_version2, scar,