Verzweifelter Lehrer kämpft mit Tablet

Middle-aged male teacher in casual button-down shirt standing at classroom desk, frantically tapping and turning a tablet device with confused expression, furrowed brow and slightly open mouth showing bewilderment. Warm natural daylight streaming through large windows, colorful educational posters covering walls in background, student desks arranged in rows. Realistic documentary photography style with shallow depth of field, soft shadows, authentic classroom atmosphere. Teacher's body language shows technological frustration - slightly hunched shoulders, one hand on hip, the other desperately poking at screen. Vibrant but natural color palette emphasizing everyday school environment.