The purpose of creating this image is improving my skill using the lighting, and the goal I would to see is the sunshine on the sea, because August is a very hot season, the sun is very strong and harsh to the eye, and maybe there is some steam arising on the sea level.
The lighting
I use two omni lights in this image, and I plan to use one of them as the big strong sun, other one as the normal light, to shine the whole scene.

1. Sun
Go to lights, and drag a omni to the top view and adjust its position, to make it just show on the top of scene,

Set the Attenuation value for this light: this value will be set depend on how high the sun is in this image. The value for my image is Near Attenuation 0,180, Far Attenuation is 180,880.

Add a lens effect to create the sun effect, setup the lens effect,

and add Glow, Ray, Auto secondary, Star and Steak in the lens effect parameters, and then setup the value for them by clicking them on the right panel.

Lens effects globals

Ray

Star

Steak

2. Now drag other omni light on the top view as normal light, but it should be high enough to shine the entire scene,

Set the Attenuation value for this light,
Fog


Choose the Helpers button on the right panel, and Atmospheric Apparatus, and choose the SphereGizmo,

and drag it to the front view to create a fog area

I just need the top area of SphereGizmo, so click hemisphere to cut the bottom part.

Click the button setup to set the values for the fog, and modify all the value in the new panel.
Rendering
I use a sky picture as the background, and a camera to pick the good angle picture.