As I mentioned in Sex and Copyright attribution of third-party creative works is essential when using those assets within your own creative work. I prefer to credit in the most inconspicuous way possible so that the piece flows, so I favor Mouseover or Hoverover text. This blog is hosted by WordPress.com and they have given me easy steps to accomplish the Mouseover Attribution. Here are the steps.
1. Click on the image in the edit mode. Then click on the pencil (for edit) above the image.
2. Click on the Advanced Options arrow at the bottom of the Image details window.
3. Enter the credit in the “Image Title Attribution” line and update it.
4. Hover your cursor over the image to check the mouseover text is active and working. And you have it!