Looking for Feedback! Terrain Design

I made this Map in 40 minutes. Rumble Royale - Roblox

Can any terrain designers give me feedback or tips to make it better, thanks!

I do find that there is a few major problems with the terrain, the one which i mainly find is the “material” of terrain used. For example this part of terrain below:
Screen Shot 2021-02-12 at 13.11.30

It is all mainly one material and i would say that it does not work, personally i would say it would look better more rocky and that their is a small water pool at top which connects to the waterfall as the way the waterfall is like at the top really puts me off.

As well this terrain parts:

Screen Shot 2021-02-12 at 13.09.40

For the surrounding areas of terrain around it, it does not work well at all and for the second image the little grass bits in it needs to be fixed, i would smooth both of these areas out and flatten them a bit or remove the second one in all.

The other thing i would say is the remove the current vegetation from the water as it does not work very well, i would replace it potentially with lily pads, pothos etc. Also around the pond i would put plants and smaller rocks/make the surrounding ground of the pond rock or sand.

I’m not much of a terrain designer but looking at the waterfall area alone, It’s a little messy and just needs smoothed out a little more, an example would be right under the water fall where you can see how you used your brush tool: