Copyright law on images

Yes, in the United States there is a time-limit for the copyright of a photograph, even if the image has been copyrighted with the U.S.
Library of Congress in Washington, D.C.
How long a photographic image remains copyrighted depends on when it was made.
Copyright is possible by registering your photographic image with Library of Congress.

It is important to know exactly what a copyright is in order to understand how it is to be used or applied in a legal setting.
Copyright laws in the United States state that copyrights are legally exclusive rights that are granted to the author or creator of a creative work.

The copyright owner has an exclusive right to sell, copy, distribute or reproduce that image; anyone else who does so without his permission is in breach of copyright laws.
Remember that just because an image has been uploaded to the Internet, does not mean it is necessarily free to use.