You've done a very nice job capturing the fluffiness of the clouds. Another option for composition might have been to zoom in a bit and use the lighthouse for framing, or instead to eliminate the lighthouse and choose a different foreground element. The colors were good, and the line of the horizon is also good.
Nice peaceful looking shot, great cloud pattern. I think I might have liked it better if the lighthouse was more a part of the picture, but without working with it, I can't say for sure. In any event, I give this an 8
i think the horizon could have been a little higher or lower - seems akward as it is now bcos you have some half trees in the foreground and the lighthouse is becoming part of the 'middle' ground rather than standing out immediately