Made more realistic scene(work in progress)

Hi guys, I am a relatively new blender user(7 month user).
I find one photo on Pinterest and I’m be interested. Now, I want to make some similar scene and I am start before maybe 3 days.Now my question is:
What I can do(some experience user hints) to my scene look like total realistic?
Of course, I must add a realistic materials,but lighting is my problem(I don’t now maybe I can add IOR,some smoke to see a beam of light or something else).