Great work, love the lighting and the posing!

Lighting is with a simple HDRI only. The trick is to rotate it until the lighting creates lights and shadow (there is a cool tool for that : https://www.daz3d.com/iray-light-manager-pro and it is on sale right now.) Dreamlight suggests also to obstruct the light with simple squares to create shadow blotches in outdoor scenes. There is a small tut on that on youtube (still have to try that, though).

Thanks for commenting so often on my renders, please feel free to comment critically also, since i see this as an opportunity to improve.