Very nice, a lot sharper than the old version, a nice lot of detail too, I like the aircraft near the left harvester, although upon closer inspection it just looks like a cone and the flame coming from the left 'harvester' looks a bit off.
That is just nitpicking really though because other than that I can't really find anything wrong. It'd make an awesome setting for a video game or movie.
I should‘ve trusted my feelings. These are the two things I‘m unhappy with, too. Both the flames and the aircraft are too much and yes, not really well done.
But that‘s why I post my work at dA. Only the criticism of you fellows makes me improve my skills. So, thank you very much! And keep on nitpicking!!!
For the smoke and clouds I made me a dual brush (PS CS2) that spits out some basic cloudy shapes. Then in an second step I used a similar brush (a bit smaller) with dodge effect to light up the borders of the clouds. Finally a slight motion blur effect.