On this page, I promote some links to (I think very useful) assets, I came across on various marketplaces. There is something for everyone, but the main focus is set on environments. I hope you´ll find something the helps you with your project.
Texture Artists: Roughness Imperfections
Houdini: Game Ready Procedural Rocks
Houdini: Procedural Level Design in UE4
Blender: Large Tutorial Collection on creating environments
Blender: Cyberpunk Cities Tutorial and Assets
UE4: Cyberpunk City Mega Asset Collection
Character Artists: Male Reference Poses
Character Artists: Female Character Poses
Character Artists: Female Reference Poses
Character Artists: Female Reference Poses 2
ZBrush: Tool for creating HD Humans