Hi, guys (again
). My another attempt to create realistic scene.
Here is reference:
And my:
(Don’t pay attention to the background, it’s just sketch for future). What’re the mismatches and how to solve them? I see, that they are not identical, but can’t find out where. Is the problem in textures only? I’d be grateful for any advice:)
Your door lacks the handle and the mechanisms at the top.
The main walls are whiter in the reference, yours are more gray. This completely changes the lighting. Also, the border at the bottom of the wall is much darker than what you did.
Try increasing the number of diffuse bounces in the render settings, it might matter in a white interior scene like this. Or maybe it will have little effect, but it’s easy to try.
The light entering from outdoor is a bit different. It’s directed a bit more downward in the original (you can see how it goes only halfway up the wall on the left). It looks like the light is a bit uneven and coming from multiple directions through the windows. Did you use a single area light in the door, lighting the interior evenly? You could get closer to the source by using more than one light source and putting them outdoor and coming slightly from above.
I would use a first light source coming from the left, with a smaller light radius, making that sharp shadow on the floor.
lighting.blend (113.6 KB)
Then a second, wider and softer light coming from the front, which will give the general illumination.
Now together. This light has a sense of direction to it that’s a bit more like the reference. It’s not perfectly accurate, because I would need the exact world background from the real location for that, as well as the accurate room model. I think yours will look closer than what I got, as you have the more accurate model.
The scene has a very slight warm yellowish orange hue to it that yours lack, this might be because the floor material needs to be a bit more saturated in color. Much of the light in the scene bounces off it, so it affects the color of the walls too.
The main wall material seems to be plaster in the original photo (I say that because of the way it’s stained and damaged and because of how it just keeps going on the stairs too). This means it will be extremely rough and matte, yours seems a bit too glossy. Try setting the roughness to something very high, close to the max. Also, set the “diffuse roughness” to the same value to really get the rough diffuse look. That’s going to change the way the light reacts to the whole scene.
The most significant difference, however, is that the walls and floor of the original have far more unevenness, dirt, and grime - in other words, varying degrees of roughness.
I would also suggest rendering the whole thing with pathguiding; this distributes the light better and directs more of it into the room, reflecting it diffusely.
That should not be your conceren.. you got the general form pretty well. So the question would be: is this for some architectural presentation or some other usecase where “proper dimensions” are essential or even if this is for some game. I guess the later is not the case but i mentioned it because for a first person shouter sometimes doors are bigger than in th ereal world and floors a broader.
So i think details are the way to “improve” this… and “of course” @etn249 gave some very worthful insights.. 
Well, you are able to look at the images and find differences. It’s not hard. Look at them and and ask yourself: what’s different? That’s really all there is to it.
So I see:
First of all, thank you for your recommendation. But I have a question: is it possible to make the height of tiles randomized, if it is pbr material, or I have to switch to the procedural tiling? And also the second one, how to add imperfections properly? I’ve noticed that those footprints and imperfections on the floor are hidden (?) in darkness; like they are visible in the lighter parts of the tile, but when I try to add them through mix shader, they are applied evenly. Thank you for your reply again!:]
I wanna learn how to set up realistic scenes for movies, but this one is just practice on how to create realistic materials, light and composition. Actually, I aim to achieve hyperrealism, but these are more my pipe dreams now, I guess
Ohhh then you wanna be almost perfect.. but then it’s mabye not only important what lenses are used for the shot and also some more data about the camera, but also to “rebuild” some things about the actual used camera ???
Like this one i just recently discovered:
But some other VFX artist may answer this differently..
( In fact i tried myself a bit on that photo with fspy… also using the third point.. but not a perfect match..
..so it also depends on th ebudget.. using the image for UV-projecting the texture might also be an option… if the geometry does fit better 
)
