This is probably an obvious question but I will ask anyways. What does it mean when it says number of times downloaded below a picture? Can you download pictures to use as a reference later? Thanks.

Yes, it means it has been downloaded by those looking at it..

Yes you can download it. At the bottom of the picture box is a download icon, click it and then a box will appear asking to save or view, click save and then another box will appear and you choose where on your computer you want to save it to.