Luminous clouds

Leonid the first thing i notice is that the photo is not horizontal. The water is higher on the right hand side than the left so it looks like it's flowing up hill. The foreground is the water and the boats are the middle ground so the eyes when looking at the photo skip the foreground and stay on the boats in the middle. The sky is pretty much all one color and does not have anything that drags the eyes up off the boats.

You could try playing around with the saturation to bring some colours out in the sky is there was some light up there you wanted to show.

Or you could convert to black and white then darken the edges so it liiks like the light was trying to burst through the clouds and only be shining on the boats.

Keep at it there is a photo in this one woth developing.