Do you create figures for your papers? And then publish your papers in closed-access journals?
Copyright agreements will vary from publisher to publisher, but if you have created your own figures and illustrations for your publication, nobody else will be able to reuse them, unless they are granted permission by the publisher. In some cases, not even you, as the author, would have permission to reuse those figures.
Sara Hänzi explains how to legally re-use your own figures and, in turn, create more visibility to your work.