Question: what is the diffrent between picture and photo? when can I use these two words? 

Answer: Picture:\n\n   1. A visual representation or image painted, drawn, photographed, or otherwise rendered on a flat surface.\n   2. A visible image, especially one on a flat surface or screen: the picture reflected in the lake; focused the picture on the movie screen.\n   3.\n         1. A vivid or realistic verbal description: a Shakespearean picture of guilt.\n         2. A vivid mental image.\n   4. A person or object bearing a marked resemblance to another: She's the picture of her mother.\n   5. A person, object, or scene that typifies or embodies an emotion, state of mind, or mood: Your face was the very picture of horror.\n   6. The chief circumstances of an event or time; a situation.\n   7. A movie.\n   8. A tableau vivant.\n\nPhoto:\n\nAn image, especially a positive print, recorded by a camera and reproduced on a photosensitive surface. eg."I photographed the scene of the accident"
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