What's the best way to find great images?

OpenClip, which powers search in search.anything.io is also used in stable diffusion and other generative ai image generators.
Hence searches using the syntax you are already familiar from prompting work equally well on search.anything.io:

artstation intricate delicate matte painting highly detailed cinematic lighting neon bokeh dof

you can use very specific queries to get exactly what you want:

Earth is a place in hell, cinematic shot, intricate, ornate, photorealistic, ultra detailed, realistic, 100mm, photography, octane, high definition, depth of field, bokeh, 8k, behance, artstation

Where are the images from?

Images are from the main anything.io website.
Anything.io follows user submitted sites and pages and archives images continuously.