I am an amateur photographer, and I've put a lot of photographs on the internet. For the most part, I use
Flickr when I want to make images available online. There is a setting in preferences to set the level of rights you want to have on your images. One of those is to preserve all copyrights. That means that people that look at your images can't right click and save the image That ability is disabled. I also have a gallery on my website where I make images available to order prints. I have also disabled the ability to right click and save on that site.
I am not naive, and know that if someone wants something bad enough they will most likely be able to get around any safeguards I set up. But if they're willing to go to that much trouble, I'm flattered they would want a copy of one of my pictures that badly.