Here's the matte for the first shot from this project. Done in 4k, 16 bit. The clip is available in HD here (though it's quite dark, don't know why). Matte was projected onto 3D geometry within Nuke and comped, forming quite a nice tree:
Additional stuff includes 3D airship with simple effects, waterfall (particles in 3dsMax), various bits of moving fog, clouds, water blinks, etc.
More matte paintings and digital environments coming soon, more advanced and with more elaborate compositing tricks.