HOLY CRAP!
Do you get skies like that often, Chris? I thought we were going to have a nice sunset here tonight, but, no go.
I really like the first one and the last one.
If I could offer one piece of advice, it would be to use Photoshop to level out the horizon. An easy way of doing this is to use the Ruler tool from the left-hand menu. What you do is draw a straight line from left-to-right (following the horizon). Then, simply go to Image > Rotate > Arbitrary, and it will automatically have filled in the relevant rotation angle for you. Simply click OK, and job's done.
Even the latest Digital Photo Professional has built in image rotation (they call it angle adjustment) found in the Tools menu.
Well done, mate. Those are sensational.
H