Thanks for your kind comments. It's interesting you mention tilt as I had a good deal of difficulty setting the horizontal. The problem is that the strong band of cloud is not parallel with the horizon so when it is straight the photo looks a little tilted. Our eyes must use the line of cloud as the measure instead of the horizon which is feint. I even tried to set the cloud band as the horizontal but it looked worse. It was an interesting dilemma for me.