Quick notes...
OUTSIDE:
I think you made the map itself too big. You lost track of what you could put where, so you made the huge ass farm. TWO wells...you wouldn't need two wells in real life...
Add some custom tiles to the castle tileset so you can ad more detail to the castle itself, because the plain feeling is just radiating from it...
...I don;t mean to hurt your feelings, but the exterior map is simply constructed very poorly...moats around castles are normally man-made, and therefore wouldn't be jagged like that, but very fine and square in this particular case. Unless of course...that is a junky castle...
My main advice is to make the actual size of the map smaller and start over...
INDOORS:
No problems off the top of my head. Just add more, because it too, is somewhat plain...but still. That indoors map is very nice...
I will look further into this tomorrow...