Under the My Media sub-page you can see and filter all your uploaded images to tag them with wpStickies. It offers a convenient way to quickly and easily tag images without visiting the corresponding front-end pages where they belong to. This media editor can also be used to tag images used in certain posts and pages, and the plugin will provide you a quick access link on the right sidebar when you are editing them.
Since version 2.1.0, wpStickies has a CSS editor where you can enter custom CSS code to further change the plugin's appearance beyond the provided styling options.
Please note, the CSS editor requires some CSS knowledge. Entering invalid CSS code could break the appearance of your site badly.