You could look for my micro-tutorial on wireframe look for Poser figures in the Poser forum. But, before all that, you should export your mountain as an .obj and run it through UVMapper. Lemme check ... yup, that works. So, you do that and render the picture. Go and change the texture of the mountain to anything you want. Now, you can try with spraycan. Remember, you have to be *extremely* light-handed with the can. See up there. Or render the the textured mountain, then render the object mask and go play in Photoshop.
-- erlik