I totally agree with this:

After you see the same cover photo you used in one of your own posts a 1000 times elsewhere you know it’s time to take some of your own stock photos.

That's why I shared this list. Most of these site will have images you don't see everywhere. SpaceX does look like a good project, but I think my favorite is The Public Domain Review. There are a ton of photos on that site!

Thanks for commenting.