It seems like a good showcase I like the different effects you added however. I do think it’s still in development so I’m assuming it’s not fully finished.
The first thing that comes to mind is the trees/plants. You have a small amount of decor, which fills most of the areas on the terrain do you plan on adding a higher mountain filled with vegetation or a waterfall coming down a ledge into the river? Maybe some other islands inside the water could fill in the empty spaces if you haven’t got that already planned.
I know this is a mountain showcase but perhaps you could add some rows of rocky paths leading to a mountain. Additionally, I see there’s a little pond, but you could have more objects or something decorative.
Overall, it’s a good start hope to see the final showcase.