Hand een gloeilamp puttend uit schoolbord - Stockfoto’s en -afbeeldingen

Hand on a blackboard

Hand holding glowing glass light bulb and business sketches at background

Businessman sketching a light bulb on a glass

Human hand darwing light bulb as idea concept with chalk

Businessman hand and idea light bulb concept on concrete background

Hand drawing light bulb with chalk on blackboard

Hand holding a lightbulb with an idea

Bulbs and one of them is lighting

Hand holding a lightbulb illuminated with an idea

Hand draws a lightbulb on chalkboard

Illustration on a blackboard of ideas and success

Man with five bulbs

Smiling businesswoman having an idea

Three person are drawing sings and a big bulb on the wall

Light bulb drawn on a blackboard

Colorful lighning bulb in a hand