When I was younger I drew something almost exactly like this. I threw it away or I would show you. However the fact that this drawing and mine are almost exactly alike is why this is a favorite of mine.
If i remember it right, i modelled all the trees from cylinders. Basically, just start with a small piece, and start extruding the main trunk. then add segmets where you want the branches, then extrude one of the faces, work that area a bit to make it looking proper, and keep going like that for the branches. Basically utilizing the basics of polymodelling
Thanks this has actually been a real help, im still teaching myself how to use 3dsmax, but now with that little tip ive been able to creat some cooler looking peices. Check out my latest Deviation and you can see what a help youve been.
i created the grass using a plugin for 3dsmax. Its called Shag Hair. Im not sure if its still being made, as this was quite a long time ago.
Im sure there are similar plugins available now though, that you can achieve even better results with.