You improved it quite much already. Regarding the light angle etc. I wouldn't change much more, think you've squeezed out the best options.
I like the foreground grasses, but the bushes still don't really work for me. Perhaps you can try to find some better looking? I know it's difficult, because I don't know any (free) high quality bush-models. If I remember correctly you have the Xfrog megabundle, don't you?
Lastly, the background steep mountain would be a lot cooler with some nice displacements to make it look more rocky. Some powerfractal blended strata would be nice as well.
Also, you could "fake" depth by reducing the size of the trees in the background to make the mountain look huge. This can work nicely when using proper haze densities.
My "Brand New Day"-image has completely faked sense of scales and depths. As long nobody knows nobody will mention it, when doing properly of course

Martin