The lighting is 100% default dynamic. No RTX nor realtime GI, simply default vanilla UE4 with distance field shadows and moveable lights. https://www.youtube.com/watch?v=vef_ZPLhjt8&ab_channel=UnrealEngine

I "painted" all the bounce lights with point lights, absolutely not performance friendly lol but who cares

Same thing for the other 2

This is only the skylight

Skylight + directional light

Skylight + directional light + point lights

I also sculpted the shadows in my shots by dressing the props outside of the camera

The clouds are from the marketplace https://www.unrealengine.com/marketplace/en-US/product/skycard

For this one, I put the emphasis on the fog and depth rather than lighting. So I used a lot of fog cards to layer the depth. The one I'm using is from the "Blueprint" free demo map on the UE4 launcher. Very vanilla but effective.

Height fog only

Height fog + fog cards

As for post processing, there's none aside from bloom. I tweaked the materials directly in the shader if I wanted to tweak any colors and then lighting. No davinci, no photoshop, no lut.

Bonus: composition breakdown for this lighting