Since the automatic downloading of album art is not perfect, I added a custom search option to the manual album art downloader.
I also added a few other options regarding album art.
Image Quality - The jpeg quality of the downloaded art. The lower the quality, the smaller the file size.
Image Size - Can search for small, medium, large, or all size images
Download to custom location - If enabled, the default location or the custom location (if set) is used to save the image. If disabled, the album art will download to the album's folder.