The overall effect is great Nosher. As for basing, check out the GW website as they have loads of different base effect guidelines. As for your bases, just a drybrush with a mid brown followed by a light tickle in a few areas with a cream type colours should work wonders. For my bases I use GW paints as follows:
Scorched Earth base coat.
Liberal wet brush with Bestial Brown.
Local drybrush with Bubonic Brown.
Local highlight with Bleached Bone.
Check out my Blog to see how it looks. Easiest to check out any of the large hills or woods in the pics to get a good idea. Hope it helps.
http://wwiigamingaddict.blog.co.uk/Steve J.