Popping in from my all feed and to my untrained eye I thought this was a real estate shot

Thanks for sharing! Good progress, right now it kinda looks like if high quality raytracing shaders were put on something like Half-Life or Sims 2.

It looks great but the biggest issue is your ground vegetation.

1. The ground vegetation is far too homogenous and too green. If you look at reference images of landscape designs (I can't help myself -I'm a landscape architect using blender for archviz) you'll see what I mean. Just 5-6 different species are enough to create the illusion of realism. You want ta layer the plants on to add the chaos. Also, even the most modern clean designs have old nature around (scattered leaves, branches, rocks, twigs, weeds, etc). Also, only artificial turf will look this green consistently throughout the site. Real vegetation varies. In blender you can trick this by adding a random node to a saturation node and mixing with the diffuse or texture.

2. The water could benefit from foam/bubbles etc where it crashes with the rocks.

3. Lighting. Experiment with different light angles. Using a cloudy hdri works well for portraits but it neutralizes all the shadows. In landscape renderings, shadows add depth and scale.

This looks fantastic! Nice job!