There seems to be some confusion about sourcing images used in submissions and whether or not it's really required.
Yes, it is really really required. Forever and always.
Images you take from the internet, unless they are of your own creation and artwork, have a creative license to their original creators/artists. Some of the images you might be using could also potentially be licensed to another company or business. Book cover images, mock-up artwork for games or movies, commissioned artwork, etc.
All of these things can be tied into legal ownership. That is why we must, every single time, source the images we are using.
How to properly source an image.
Step 1: Post your image.
Step 2: declare the source of the image. The "source" is the website page where you found it (NOT a direct link to the image in question) AND if the information is available, the original title and artist.
"Star Wars Purge Cover" by artist chrisscalf of Deviantart.com
Here we are giving proper credit to the original artist and the site where it was found, as we should. If you are ever contacted by the original artist of an image you are using and asked to take it down, comply and find a different image to use.
If you have any questions or comments about how to properly source images, please post them here.