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Very nice lighting and detailing- glad to see there are no nasty cut out people;
A little matte-style painting on the closest tree to knock out the sharp silhouetted poly-leaf edges might be an idea. Wouldn't take much.

Yes, you' re right:) You looked very carefully. Thank you for your great comment.

We finally finished the 1st version of this animation.
This is a short movie about "Time". We put a small puzzle in it. In the beginning, there are many numbers falling into the city, and scatter everywhere. Some are obvious, some are not. Try to find numbers 1 to 12 in the animation, plus "0", which represents 12 numbers on clock and 24 hours of a day,have fun!
Here are the links for the animation.Hope you like it, CC welcome.

low resolution
http://www.opdigital.net/ANI/op02-800.mov

Middle resolution
http://www.opdigital.net/ANI/op02-1280.mov

are You guys using Vue and Mental ray? What Platform, compositor etc?.. exceptional work!

Yes, we use Vue sometime, but not in this scene. Ususally we use Vray.Hardware: usually AMD Dual Core 4.2G 4G RAM. Compositor, sometime Fusion, sometime other software.

2 Days? How many artists?