Looks great Dan, and I agree about not going overboard at this stage.
The only thing I would do IF possible, is to add a couple of 'bare' batches here and there. If that's grass 'mat', this can be done simply - just dampen the area required, and scrape off the 'grass' - keep the scrapings. Add a little sawdust around the base of the stumps, to blend them in a bit and look like the aftermath of felling, then add the saved 'grass'. The bare patches can be painted a sandy colour, with a little sawdust added to the wet paint, for texture. Only takes a fewe minutes, and will bring it alive. Otherwise, great job mate!