Adding just a few smoke elements in your environments can add so much life to the shot it's criminal not do it.
You can use a smoke render or stock footage and assign it to a card that follows the camera, and mask it with the Depth pass AOV.
Super simple and can instantly improve your shot, basically for free.
Enroll in the full course for free:
https://voxyde.com/vfx-courses/intro-...