Hey there! :3

Firstly, terrain. A lot of it is way too 'sudden', and then suddenly turns to flat. There's no gradient from the hills/cliffs/high terrain etc, and then where it meets the flat ground. Also, the land on the base should be raised in areas - too flat! Little hills is okay, as you have the higher terrain as well - but you need to add a gradient to the base of the spikes/cliffs.
I think the palette also needs some adjustment. You've used a lot of the same blocks that you have in the structures/organics and it looks a little odd - it drowns them out too. It's also way too bright to cover your entire plot in this palette, I'd stick to keeping the terrain more subtle colours, like sand and soulsand - I'd take out the red sand to be honest.

Secondly, organics. I think I get that the organics at the front of the plot are like lizards? Judging from the tails. If I'm right, I'd suggest improving on the faces just a little - they're a bit squashed for lizards faces. Other than that, I like them a lot! As well, I love the tree and the custom cacti you have on the plot! Looking really good and fits the style.

Lastly, structure. The structures are a little uninteresting. There's a lot of slabs/stairs and a fairly common shape, with a simple roof design. This is basically the case on every building. Try and be more original with design and palette!

Good luck!
- Dutty :3