@otowa I played with the lighting for a solid 20 minutes and had a hard time coming up with something I really liked. Still, here’s a before and after:

The katana is a difficult one! I did find that I needed to add lamps into the scene rather than only rely an HDRI. Imo the cross guard and handle read better but the blade doesn’t seem like a notable improvement to me. Anyway, feel free to take a look at my version of the .blend file if you’re interested.