The OP’s question is not clear at all, so I’ll just make an assumption as to what the OP meant, and then I will answer as follows:
A picture is an image printed or painted on some sort of paper or canvas. The appearance of the image remains virtually unchanged regardless of where it is placed.
A mirror is generally a piece of glass with a silver colored backing which reflects most of the light that reaches it. Due to its reflective properties, someone looking at the mirror would see a an image of nearby objects rather than some fixed image.
Does this answer your question?