The plugin is working as intended and I personally like it as it has potential, however, it is not really user-friendly.
As a coder, I am always looking into what I can do for the user. This plugin clearly fails a few very basic functions; e.g. image dimension settings and a way to make sure the user understands that images from personal sites cannot simply be displayed. The latter is an issue for young bloggers, who just want to display their images on their pages.
I hope there were a few helpful comments in this.