I really like the way you've done the stonework here. This is easily one of the nicest MOCs I've seen in some time. It's interesting because while brown castle MOCs are a rarity, they generally look pretty stellar. This seems like it would be approriate in the centre of a large town or village flanked by a town hall and a market. Given the colourful nature of this MOC, I think that having some painted (i.e. normal) minifigs as statues set into the tower would have looked fantastic.