It looks like the foliage is looking oddly flat as there is no shadow applied. The cloverleafs dont cast shadows on the ground and they dont seem to have any normal mapping, so they dont show structure and just overlap each other without any distinction od the individual leafs. The same goes for the treetrunk wich just shows flat shading (no normals).
If nothing helps, you could fake the cloverleaf shadows by placing appropriate shadow decals on the ground. They see a little too small to generate noticeable shadows from a far off lightsource.
Its the atmosphere that scatters too much in this case 
Or use static lighting in selected areas of importance… Dynamic light for the pverall scene and some pointlights creating nice baked shadows for the hero-cloverleafs 