That's a good idea, and it looks good. There are a few things that can be improved IMO, if you care to do so, of course.
1. I don't see any reflections in the water (I suppose it's water under the bridge).
2. I would use lower grass in the mid road area.
3. I would make some tracks on the road by simple shapes, where ruts are worn out. Flatten the larger stones in those tracks, perhaps. You can use the same simple shapes (through world space) to extend the sand a bit onto the bridge roadway, so that it looks like wheels have taken sand with them and deposited there. Or worn the stone roadway there.
4. I find the shadowed areas very dark, almost absent of definition. I would say there would be some reflected light inside the bridge and in the tree canopy. In PT that sometimes happens, though RT will probably keep it too light. You could experiment with an extra no shadow sun at high level and very little magnitude (0.5 perhaps), though it should not be that way.
