broke down this speedpaint (68minutes) into 3 seperate videos dealing with basic scene setting, simple clouds, an organic skyline, and foreground elements, hopefully it'll give you guys an idea of how i work, and maybe give some of you a few ideas. 3 layers used using basic photoshop brushes (apart from the skyline where i made some brushes on the fly, included them in the rarfile), kept it simple to follow, and apart from a little cropping and contrast adjustment, you get exactly what's shown in the pic.

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basic cloud formations - (22minutes runtime, winrar needed, xvid avi) -[ [link] ]-

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basic city skyline - (24minutes runtime, winrar needed, xvid avi) - -[ [link] ]-

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foreground elements - (22minutes runtime, winrar needed, xvid avi) -[ [link] ]-

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hopefully you guys will enjoy them.
any problems with playing the files, try installing the xvid codec first (google it), if you can't get it to play (winamp & mediaplayer sometimes have a problem with xvid as it's the codec pirates use on dvdrips, they installed security measures on some versions) just download vlc player from videolan.org, it'll play anything and doesn't mess with your current setup. Also, winrar is easily available, but winzip/winace etc will handle the extension in the extension manager.