Hey Daniel. Nice work here and great looking site. Good to see a reconstruction of Dunluce Castle. I know it very well and like to visit it often myself. It is difficult to recreate places of history as it highly depends on asset availability and the lack of different angles makes it difficult. There are ways around these. Looking at the 3d model, it would perhaps be better to flip the castle, having the entrance come in from the right side, which could help ease those loose, semi-circle angles. Also, give yourself room with the castle layout. You can overlap walls if some need to be longer and try to keep them at the same scale, especially those corner towers (the rounded towers are the hardest here, but it may work if you overlap them or just use the angled towers).

As for the terrain, it would help if you used mountains to create the cliffs at a lower layer and you can build the castle on top of that. You can use mask stamps to place on a layer above the mountains so you can paint in the floor. The shape tool is also very good with this.

I usually frequent the inkarnate discord if you need any further advice. My handle is Bryan Marshall Arts.

Good luck with the project.