This is a game I like to play on the @SketchUpUK instagram account.
Real or render?
I’ve made one of these images using a photo as the reference.
Made in SketchUp Studio
Which is which?
Blur/Spoiler out your thought processes or anything that is a major giveaway.
[spoiler]I’ll guess the one on the right, SWOONFINAL, is your render.
Where to start?
Give-aways:
The wood grain on the legs of the chair and ottoman.
Hand print on the seat cushion of the chair.
Little puckers in the seams of the upholstery on the chair.
End seam in the piping on the ottoman cushion visible in the photo.
Deformation of the upholstery in the photo that isn’t present in the render.
Woodgrain on the floor in the render is not quite right and the planking in the corner under the curtain makes no sense.
The seams between the floor planks look like gaps in the photo. In the render they look like black caulking.
In the photo the wainscoating and baseboard have clearly been painted numerous times and is rough.
The baseboard trim in the corner has a gap.
Edges of the rug isn’t perfectly straight in the photo and the rug has thickness which isn’t present in the render.
The grain direction on the pedestal f the little side table is wrong in the render.
Repeated grain pattern on the top of the table in the render.[/spoiler]
I agree the left one is definitely a photo.
You would be correct!
But they are just answers, not thought processes or major giveaways.
Depends on what you consider a major giveaway - although I just realised I can hide that one now. So I’ve tidied it away.
correct
I fixed it and added some of the reasons I came to that conclusion.
My guess…
left: photo
right: render
I thought i saw some repeating parts in textures? 
I agree with the crowd, but it’s too easy, they are side by side, you can quickly compare and se one is a little less real than the other.
If you were to post only one of the two, at random, now that would be harder to identify 
Yeah, that makes sense. Usually we post a photo or render and ask which it is - much harder to tell in isolation
For me the biggest giveaway is the floor. A wood decking with gaps between the boards is never used inside in the world I inhabit. And the curtain on the left image just looks too good to be modelled - possible, but improbable.
Please continue with these.
About the right image:
I was wondering about the light source in the lower right corner behind the curtains, down at floor level “on the other side” of the wall. Just one of a few things I noticed among the
things others have mentioned.
Interesting, as that is how the floorboards are in my house funnily enough - it is 130 years old. And perhaps localised to some extent - so that as an implausible detail didn’t cross my mind.
And it’s made worse as I didn’t apppy the slithers and fill the gaps when I sanded the boards a few years back.
My energy bills pay the price now.
I didn’t give that a huge amount of thought generally if I’m honest as I grabbed the first approximate match from chaos cosmos.
It’s interesting to read that took people into uncanny valley however.
that must be some kind of lighting bug or colour error. Note to self : don’t post high resolution renders 
Keep em Blurry
OT: I saw a similar construction in the oldest Helsinki University laboratory building from 1865, but it was an underfloor that was covered with about 3 cm asphalt. The same building had wood floors of thick planks but they were butt-jointed and joined with pegs.
As a newbie, this just blows my mind. Everything done in Sketcup?!
SketchUp to compose the scene and v-ray to render the lighting and materials
First one (I’m looking at my phone in portrait mode) is real - the hem on the textile is part of the give away. Another is the texture mapping on the legs of the render.
