Hi Bob,
This has the potential of becoming a really cool and realistic render. However, i think you should consider the doing following things for getting there:
- the cumulonimbus are interesting, but the "unrealistic" aspect of these is that they are "just" those sharp edged formations. The sky would potentially benefit greatly from mixing in another, less defined cloud layer.
- use a higher quality grass. The one you are using looks very CG. Walli's grass pack 3 would be ideal I guess.
- I agree about the distribution of those bushes, but also they need more variety.
- On the bottom right, the soil is completely smooth, that does not look good. Rather add more fake stones there, or even better, use Ryan's dirt pack. If I recall correctly you already have that pack. Look at Ryan's demo render with the motorcycle. He used the dirt pack in the midground behind the tarmac, and I think that looks extremely realistic.
Cheers,
Frank