In cycles!
The light source is being filtered through a window, causing the shadow pattern, and the haze effect is made by placing a volumetric cube around your scene. If that isn’t the answer you were looking for, please be more specific in your question.
I have tried a lot, bur results are not satisfying as much, can you tell me what i am doing wrong???
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as a viewer, the environment looks good to me. the only thing that raises my eyebrow is how straight the student is sitting… no student has that good of posture. 
Tbh, I like yours better.
If you want it to look more like the reference image though, yours seems to have less fill light from the sky (ex, it appears to be a clearer day, so more direct sunlight and less diffusion from the clouds). There’s also a dust particle effect going on in the reference shot. And the white point is different, the light is warmer in your example. You can push it cooler in post-pro, or just tint the color of the sun light.
Hello !
On the overall it’s ok, but it’s hard to pinpoint what bothers you …
Is your issue is really about lighting , or it’s the image that doesn’t feel as good as it could be.
My advice is to focus on learning storytelling and image composition, that way it’s possible to use lighting as a tool to make the image more clear.
But if you are 100% your issue is really with the lighting , then we can focus purely on that.
This is a really good read if you want to learn more about lighting : https://chrisbrejon.com/cg-cinematography/
If you are really serious about the subject take the time to read that and your are very likely to improve a lot from that !
I want that contrast like pinkish - yellowish background separating with foreground which is high in contrast, in my case the sun is affecting overall light in my scene if i were to add p-y tone separately!
Try changing the color of your fog cube to pinkish.
Then it loses contrast between corners and looks washed away, is there any way to sunlight cannot affect the other things??
Sorry if this is late, but I have just stumbled on this and I think I see something no one mentionned.
The reference seems to have a little bit of blur mixed in with the render, which helps give this slightly vague, dreamy look.
It can be easily replicated in the compositor.
The reference seems to have weaker sunlight, and it covers much less of the scene. There also seems to be a second, softer light with a blueish hue coming from the window and acting as the main light source.
room_lighting.blend (967.8 KB)
