Roland, all the elements here are beautiful... the sky, the composition, the boat... the water... but I don't know why there is something here missing. linking the all together!!... I don't know... I wonder why it is gray in some areas!... as for the lower right dark part, open the file at PS, check out the red, or may be the green channel, if there is any details there... load that channel selection, and try doing some dodging on that ares with say around 17% opacity... I think you are going to bring out more details in the dark part.... hope it works
Roland as you say, its a little dark, however the composition is very good, would have liked to have seen a photograph taken a few minutes later when the sun would have reflected off the clouds,