hi, thank you all for your comments, and excuse me for writing in english
To answer some questions,
I admit the x-wing is too small and lack projected shadows on the building, that's true. I did not model the x-wing (I wish I would have did it!). But it was a 4 hours challenge I did on a bored sunday so a lot is missing.
I will write a little "making of" soon, which will be available at same url.
my demo reel is available at
http://www.onickz.com/demo
it changes often as i only work on it between two jobs