doesn't look like google photo's is a very good option.
https://sites.google.com/site/picasa...nk-to-an-imageAt this time Google actively changes its image service behavior. Now, there is not any algorithms how to receive direct and permanent links to your shared photos. The URLs are received by the right-button click, like https://lh3.googleusercontent.com/(L...)=w800-h600-no, are temporary and live one-two days and then will be closed.