Really like that fog, the scene has a really thick atmosphere - it's subtle, so it has that nice organic feel.
One option for foliage transparency issues, is using good old mode 4, transparency mode 4 is 1-bit alpha, so it's pretty good for nice round leaves and stuff. It can sorta determine the look of the scene, like if you had clumps of foliage rather than soft grass, the foliage would stand out. Personally, I like foliage with trans mode 4, but reactive, so when you move over it the plains rotate away from the camera - like a really cheap Crysis foliage effect. In third person, it would look cool to have it sway a little, and flatten as characters walk over it. With a good indexing system (maybe based on a reference grid) it need not be processor intensive. One option if you can sacrifice soft grass (and transparency issues) for lush leaves.
One thing is for sure, soft alpha transparent grass is damn tricky to draw and capture, at least we have a fighting chance with leaves

.