Hey there! :3

I like your terrain - you have good variation, and a nice floating island! However I wouldn't use ores to detail the stone, I'd use blocks like cobble/andesite etc.

Secondly, your organics. You have really nice trees! However, there is one that is a little out of place - the leaves are shaped like a pyramid. It doesn't fit on the plot!

Lastly, structure. The boat is way too simple, and replicates modern, which is not ranked.
As far as the buildings go, they're okay, and have good detail, but the roofs need some improvement. Make them something along the lines of this: https://imgur.com/a/Lr9Ab#0
I wouldn't use quite so many cobblestone walls as detail - they should be used sparsely; too many looks odd. Instead, use stonebrick stairs/slabs - not too many, but a few just to make some basic shapes and design.

Good luck!
- Dutty :3