The S5 Like Me plugin when activated will show a little icon on images. A user can click the icon and like the image. Each vote will be added to the count on the icon for that specific image.
You can set the plugin to show on images inside HTML elements by specifying the ID or Class in the admin of the plugin. Multiple IDs and Class names can be set by adding a comma after each name.
In the admin area you can also specify things like opacity, hover opacity, colors, etc. Lastly each image that is liked will show in a list in the admin from most liked to least liked.