Hi John. The jeep, figures and bridge look excellent. The trees look very bare though. The two that are there look good, especially the one with the yellow clamp, but the scene needs more of them. Its very usual to see these trees, but they grow in clumps along road sides.
Adding some height to the base, would also allow for a natural drop to the river bank. doesnt need to be much, but it would add to the effect.