The second issue with low-level is clutter. The clutter at the moment only gives you a very vague concept of how far you are from the ground, and those sheep seem to be the same size as the trees.
Perhaps a few more clutter elements would help, and a review of the accuracy of each items size.
Lastly, how about using a per-map algorithm for the generation of static clutter, or possibly allowing the placement of 'forests' which are just static clusters of trees that do not dissapear when clutter is turned off...