Clouds should move too. :E

I think the clouds should be aa'd into the sky to make them look more like a part of it rather than sometihng stuck to the window. Also, you could add a few whisps of lighter cloud going past, over them... might be a bit too fast though... if they're really transparent against the background though it shouldnt look too bad.  I like this though, especially the air movement.

About the clouds I agree with the others. The idea is nice, everything could be better, but hey: who's perfect?

 yes thats exactly why I didnt make movin clouds, sedge.  Bruce and Bryan are right, it looks a little awkward.

Moving the clouds slowly across the screen would balloon the amount of frames.

I think some of the choppiness varies... when I look at this at home it looks fine, but when I look on my work computer it gets a little choppy.  Cool work though. 

 It's nice... but a little choppy. And why arent the clouds moving? They look like paper mache on the window.

 when moving, clouds usually move very slowly. They don't hurry across the screen, but they do move some.  

Oh I didn't notice the clouds not moving.. but I guess they'd move slower than the trees anyway? Very nice.. I can hear the clicky clack of the train :) or is that just me making that noise

 For me when I am on a train, the clouds never seem to move either...  I like this great job

 It looks good, but the clouds shold be moving too.  

this is awesome. Although.. I only see it as going towards the left. Excellent piece, lovin' it.