Hey there :3

So first of all, your terrain. The blend from the mountain to the ground is a little awkward. I think you need to bring up the land around the bottom of it a little, just so it doesn't suddenly change from mountain to flat ground. Other than that, I love your terrain. You have really nice atmosphere with the trees and the mushrooms, and little pathways leading through them :3

But your structures at this point are the only issue. I think the detail on the tall thin towers is a little basic and has room for improvement - less cobble walls, maybe some more creative shapes.
The stone building is nice though, although the shape is a little strange, where you've transitioned the top half into the bottom half. It could be quite nice to add a little bit of colour too, but only a little bit, as I know you've called it 'The Lost Lands' :p
And your hot air balloon could use some reshaping. The stair-step effect on it makes the balloon look less circular, and more triangular. Try some things out, don't make the shape come down by one each time, maybe search some pixel circle generators or something, then you'll see what I mean :)

Good luck!
- Dutty :3