Maybe I can't find some good graphics on Castle, or I'm missing a great demo / game made with it?
Well, as pascal is less popular than C#, so Castle Game Engine is less popular than GODOT And the thing it really lacks (yet) due to this fact is cool modelers/painters who can create beautiful models/textures/sprites.
Well that's not the point, textures are available for free online, and also normal map, bump map, or you can generate these easily with online tools.
Free 3D models online can help you also.
So the thing is that it needs a good demo showing all 3D features.
I Will give it a try to see by myself.
Edit: Installed and run demo of fps_game, well in the material .xml file I can enable normal map, it's a good start.
And I have all these 3D models made by myself:
https://www.artstation.com/lainzI can share you anyone of these you need to make a proper demo, with good lighting, environment textures, normal map, etc.. (just the model, I think I lost some of these textures, but again I've downloaded them online, so easy to replace).