The volumetric light rays are neat. I can tell the light angle in the last image is different from the angle of the light rays, which to me suggests they are controlled by a different object. I like the rays so much that I would find a way to shear the rays based on the direction of the sun so they stay parallel to each other. You have cultivated texturing, light, shadow, ambient occlusion, and surfacing well since your first attempt so I feel like you're on a great track. Keep it up!