Thanks for your nice comments, guys.
Techart -> About the foliage, i took a photo of an ivy leave and made some color variations with photoshop, and create some specular maps. And i have mixed all the different leaves with the max Particle flow, allowing me to create fastly some size and rotating variations.
Another great stuff about the particle flow is that you can use a node that prevent the leaves to not being fitted in each others (hope you understand me, my english is not perfect…).

nice detail.