Currently I'm working on a shower design project for college, the final presentation is in 2 weeks and I've done some renders (octane standalone)
v 1.55 (still...

How could I improve the reality and noise of the renders? Materials, lighting...
These ones are rendered: PMC, 5K s/px, Full HD with a single gtx780Ti, took about 1 hour and 20 minutes average.
In the 1st one I'm using 10 IES lights (mesh opacity 0%) around the perimeter of the walls and another normal light source after the windows portal material along with a nightsky HDRI, as soon I get some critics I'm going to change the screen material to emision when on low light, just to be seen. Furthermore, I aim to add a texture to the projector with different colors to light the wall in more than one color to create a cool cromotherapy effect.
The last ones have less noise in "day mode" daylight environment + light source after the windows portal material (opacity 0%).
Please criticize in any way,
It'll help me a lot!

And ideas are accepted!