Hey there!

First off, Ima talk a bit about your terrain.
I actually really like it. The simplicity of the palette is super nice, with the stone and occasional grass/dirt blocks thrown in. I really like it. I also appreciate the fact you've built down into the plot, instead of on it, if that makes sense - it's original. The small waterfall looks pretty and fits well with the plot, adding some colour for contrast :3

Secondly, your organics. You have one organic; a tree, which is actually pretty nice. I like the colour theme you've gone with for this plot, and the faded out block of the log works on here too. It maybe would be nice to have another tree somewhere, or at least bushes, just for the colour on the base of the plot.

Lastly, structure. Again, has a very simple palette, but I think this is where the palette really mattered. You have washed out colours for the terrain, so the structure really needed to be bright and show off that colour for the plot, which it doesn't do. It has a perculiar shape to it, and very little depth - however, it does have some detailing, but it's all the same - add some variety other than only cobble stairs :3
I think the structure just lacks purpose, honestly. Just seems like a statement, in the middle of a plot.

Good luck!
- Dutty :3