To dream of a picture or photograph represents a memory or mental imprint of an experience you had. How a situation was remembered or is perceived by you after it has occurred. A lasting impression. Ensuring remembrance.
To dream of taking pictures may reflect the importance you feel on remembering current actions at a later time. A wish to remember yourself as having done the right thing.
Negatively, pictures may reflect a bad memory of yourself. Memories of yourself having made a mistake, not stood up for yourself, or having embarrassed yourself. A bad impression of our past behavior or actions. Remembering something bad. Trying to manipulate how an event is remembered. Alternatively, it may reflect an intentional choice to take actions so that something will be remembered in a negative way.
Look to the content of the picture for other symbolism to help you understand what kind of impression certain experiences left on you.
Alternatively, dreaming about pictures may reflect your interest in photography.
Example: A man dreamed of seeing a picture of himself and feeling bad about it. In waking life he had made a really bad choice to ignore advice and now had to live with the memory of it.
Example 2: A man dreamed of seeing an old war photo. In waking life it was the 60th anniversary of V-Day and he had made a stupid remark to someone else while remembering the war.
Example 3: A woman dreamed of looking at photographs. In waking life she was trying to remember treasured memories with a friend.
Example 4: A young woman dreamed of looking at photographs on her computer. In waking life she was remembering seeing her favorite band live.