Hey cool, I was just referencing some Bosch painting myself for a 3d project I am working on. Were the grass and trees done with Paint Effects?
For crits: In the second render, what happened to the bottom of the tree. Looks like something got cut off.
Maybe add some fill lights; the images seem very dark on my monitor.
Yea, the trees and grass were done in Paint Effects. Dragged my scene down to a crawl with all the polygons in the image.
I was going for a surreal kind of feeling, with lighting coming from sources that don't exactly seem realistic. But I agree. I don't know as much as I should about Maya yet, but some kind of Atmospheric lighing (I was limited to my knowledge of Spot lights and Directional lights) might have helped.
Thanks for the comments and crit, however, and best of luck on your project.