There is a man in a suit and tie giving a presentation

1. The male teacher in suit stands on the podium and gives a lecture to the students，‎Classroom，blackboards，fresh flowers，cinematic lighting，depth of fields， lens flare glow，8K， RAW photos， sportrait， best qualtiy， 超高分辨率， realistic , pointing his finger towards the black board

(nsfw:1.5),paintings, cartoon, rendered, anime, sketches, (worst quality:2), (low quality:2), (normal quality:2), wet, child, chest hair, dot, mole, lowres, normal quality, monochrome, grayscale, lowres, text, error, cropped, jpeg artifacts, ugly, duplicate, morbid, mutilated, out of frame, extra fingers, mutated hands, poorly drawn hands, poorly drawn face, mutation, deformed, blurry, dehydrated, bad anatomy, bad proportions, extra limbs, cloned face, disfigured, gross proportions, malformed limbs, missing arms, missing legs, extra arms, extra legs, fused fingers, too many fingers, long neck, username, watermark, signature,