First, not a criticism, just a curious question. Why the long, long morning shadows outside?

The grass texture hopefully is one of those on your fix-it list. The tile redundancy distracts to an unfortunate degree, drawing attention away from the main map.

The relevance of the final points relate only to the extent that you want to make your castle look like something from the real world.

The individual stones in the floor tiles are incredibly huge. I've been in many castles with stone floors, but I've never seen floor stones more than a third of that size. I also never have seen tan floor stones, like those in your interior floors.

However, I would add quickly that I see no particular need to emulate reality on this level.