Hope you don't mind but I thought I would give the first image a try.
Your image I think is 90% of the way there but you need to push your light and darker values. Tempus is right, for instance you have really bright light rays coming from the window and yet your room is already quite light, if you lighten the room around the light source then it should become weaker and almost blend in, The brightness as you have it would only really happen in a much darker room so I basically darkened the back wall and everything that wouldn't be hit directly with the light, looking at my own take on this I think I may have gone a tad too dark on the sides

. Because the walls are darker you can now see some nice dust particles.
I should point out that you wouldn't get the nice glow effect that I have on the chair but I did most of the paintover with a soft brush and missed a few things when tidying up.
Another thing that you need to think about is materials, I noticed that you have coke cans on the floor but they have no reflective light on them, this is something i'm only just getting to grips with and doing this has taught me a few things as well that I forget to do sometimes.
Oh! another thing is I changed your light source from pure white to a softer less pure colour as I have learned that you only use pure white or black sparingly and only to put emphasis on whatever it is that you want the viewer to focus on, I think the glass bottles in the first image are a good case for this as I have put too much reflective light on them and almost used a pure white too.
Sorry things aren't in order much but i'm quite scatty and just thought of it
I should just add the fairy lights on my redo's are too bright and probably wouldn't put out that much light, at least I don't think they would looking at them.
Ummm... I think that's it and I haven't forgot anything
This is my finished paintover looking at it now I may have gone a tad too dark in the corners.
On this image I wanted to draw focus to the laptop area so I made a duplicate of the whole image and added gaussian blur, added a layer mask to the layer and used a soft brush to erase the centre area to give a nice blurring effect on the outside only, could have pushed it more but I was just trying things out.
Final image, I figured I would desaturate the image as when I compared it to your original I found I had made mine too bold ( I'm not great with colours yet ) for want of a better word.
Hope this helps you and what you where looking for.
Here is some bigger version...hehe i'm so nooby
