Hey there! :3

So terrain, looking better but still flat in a lot of areas - I like the decoration you've added with the pond, and the floating island is nice too! I think some little wheat patches would also look really nice, because of the castle theme! :p

Secondly, organics. The dragon is looking better! However, I still think you need to make the wing out of a different block type, instead of black wool with the rest of the dragon.
Also, your grounded tree still needs roots! Have them extending out from the bottom, instead of like a large stump at the base. Search Plutouthere on YouTube for his tree tutorials - you could also check out his dragon tutorials whilst you're there!

Lastly, structure. Like I've mentioned, still needs a lot more detailing. The walls around the windows, and on the towers are way too simple, and flat. Stonebrick stairs/slabs/cobble walls etc. Experiment, and make it pretty! I think throwing in some colour somewhere too, maybe with some logs or something, would be a really nice addition! Another house like the one you have next to the one you have, or on the other side would be cool, so it acted like a village! :3

Good luck!
- Dutty :3