Then RENAME each file so that you know what it is before you select it - imagine yourself to be a librarian - would you have books on the shelves with no name on the spine?
At the higher level RENAME the folders if necessary - the structure you use is down to you - and you can put folders inside folders like this....
Art/France/Fragonet/TheSwing
Art/France/20thcentury/Transport/Normandie
It's your decision..., November 2015