My Best Creative Assets
Jessica Johnson who is Creators Couture is a talented designer who shares her talent with us. For using in Adobe products primarily. Her site is filled with tutorials and examples. I love her brushes.*
This is a royalty free site, that is indeed free. However make sure you choose Pixabay images because there some some images that are offered by iStock that are paid to help support the free Pixabay. You may want those, but just be aware.