A 3D environment concept built in Blender and additional polish in Photoshop, the character was created in Zbrush with Daz base, fps model was downloaded from Sketchfab:
https://sketchfab.com/3d-models/first-person-cso-coil-machinegun-ee8fc799ec284524ac998e0a22e43951
https://sketchfab.com/3d-models/dual-shotguns-free-download-53c853edd6a141fa90914118cf1bfa0f