its ok, a little bit bland though. it needs some focus of interest to make it well, interesting! most (not all) dojos have some kind of shrine, usually dedicated to the founder of the dojo. often this will simply be a portrait with some japanese scrolls hanging on the wall with some incense burners. or it can get quite elaborate with samurai armour and other artifacts.
and some traditional wall art will make the place stand out as well
secondly its a Naginata dojo, so some actual Naginatas would be good
the Naginata is basically a sword blade on the end of a staff, but it is a different kind of blade to the Katana, being wider and more curved. the kataknas on the wall look ok but i would prefer then sheaved and on a rack rather than naked and on hooks.
the lighting you are concerened about, your concered wrongly, theyre not bright enough! the ground floor looks ok but if you boost the light from the top left windows,angled down towards the center of the room will bring a lot of life to the scene. using that light-beam effect would be ideal for this scene, and a subtle particle effect to fill the air with dust motes just to catch the light.
i cant really tell if there are texturing issues exept the swords are looking a little dull. less roughness and more gloss i think!
i’d throw in some more references but i only get three per post! maybe next time. keep it up this could be awesome once its done!