Copyright won’t go away by just crediting. I believe you have to pay to get permission to use a copyrighted image and if you don’t, the owners of the image may take legal action.
This image that you’re using is copyrighted because I can see the watermark has a C in a circle, which is the symbol for copyright.
However, if it was posted by another Episode user, they probably didn’t pay the copyright either. If they did, it’s still pretty risky so you shouldn’t use it either way.
You should check if the other images are copyrighted by doing an image search.