It's a nice level, but it's too similar to the Wiluma Mines.
For starters, You need to merge the dirt around the mine entrance and add a small pathway.
Take a look at your door. Look at the tiles above, They come out one right? Why doesn't your wall do the same thing? It's a small error here; but it defeats the purpose of your bringing the door out a tile when you will not do the same to the wall as well.
If you don't want to bring the wall out, then simply carry the wall on as if it would go behind the door.
You need shading at the front of the desk. The desk isn't off the ground? Unless that's the impression you were trying to give.
Show us your Originality.
Find a levelling technique that defines you!
Find a tile/set of tiles which you like and see what amazing structures you can come up with.
Your level has far less errors than when you first started; highlighting learning is taking place.
Well done
Oh btw:
If you would like, I could make a thread/video explaining how to add lights to your levels as your level can be made 30% better just by adding lights/effects.
If you do already know then it would be amazing to see some of those in your levels.
It's fairly basic scripting and all you have to do it change the numbers to meet your colour desire and intensity.