Cut your image and Watermark....

[call ducks]

So every one knows about watermarking, that is an effective way.

here is a way that not all sites support as you need to upload many images to get one.

if you try to save that image ( i am using it from this topic: https://www.backyardchickens.com/forum/viewtopic.php?id=541697&p=2 ) you well not get the whole image.

i cut it in to a few pics. use this as many sites like ebay only upload one image then a new image box etc. so unless they can (hard to do) stich it back to gather they well not be able to get your image

 

[Whitehouse Quail]

Or you can make two keystrokes of ALT & PRTSCR, paste into Photoshop, and crop down to your image.

 

[Saltysteele]

edit