A picture is worth 1000 words, but still needs a caption

looking at a picture without a caption is like watching television without sound. A photograph should attract the attention of the reader. A good caption can continue to fill the details which are not in the picture. How to give a good caption, you should be specific: give details.
You should tell something different, thats not shown in the picture. You should'nt use just first or last names. Use leads that well capture the readers attention.