Hey nice scenen you got there.
Your light rays, don't cover the full scene.
Seeing how high your sea is, and how sharp the occlusions are, i doubt that's realistic scene. It should be very blury and dusty, sandy, just crap
Also based on your fog.
Maybe do some google video searches, that should help alot.
But it's a nice scene!
to wod thats the power of occlusions