To download photos from your online gallery simply right-click on the image and select "Download" as pictured below. Selecting "Original" will download that single image; selecting "All Available" will download all the photos in the album.*
*Note: Download options are not available for some galleries. Choosing "All Available" will download them into one large zip file; it may take a couple minutes for the download to begin. Additionally the menu will not appear if you right-click on the thumbnail images.
Selecting Images: the video below demonstrates how to select multiple images for sharing and downloading.