Beautiful, really.
Now, looking at the first render, I eyeballed it as a 4 feet X 6 feet patch of grass.
How about testing an average frontyard, let say a patch of 30 feet by 50 feet...?
As long as you are doing all the work, how about 100 feet X 100 feet field? Larger than that would not really be necessary for a still picture.
Sucking up mode ON
Tu travailles vraiment bien!
Sucking up mode OFF
Does that gets me the test images...?