'Hawk - Relatively small problems, yes, but still problems, and too many for my taste. You're right, lightning would've been a good touch, wish I'd thought of it.
Dragondack - Yep, I made the rain. I adapted a <a href="
http://www.axangec.com/tutorial/ps/rain.php">tutorial</a> I found online. The effect shown there is a bit off to my eyes, but if you make the "raindrops" thinner, and do a couple layers of them, it looks quite good.
Max - Thanks muchly. I must admit, I like the sky -- it's unrealistic, but it looks good and produces the right kind of mood. Call it artistic license, if you will!