all photoshop. a linework base guide is gotten from MAKE2D in Rhino

Thank you for the reply, l3wis.

But what about the shadows? Don't you think there is a basic render behind to give the lighting base guide?

like a bad david hockney.

Hockney and/or Anthony Ames

Sigh, do people (students) even know how to reference paintings as a way to make illustrations anymore?

Like a bad David Hockney? where was the good David Hockney?

it's not Photoshop, it's a lot of V-ray effects and little touch on photoshop.. it's a question you can ask your colleagues not sthg that you post on a forum, that's why nobody replied you.. you're Egyptian?  

Zaina, that is actually all Photoshop, with linework from Rhino, as l3wis said. It's all overlayed with different textures and flat colors with many layers of fake shadows and ambient occlusion.

look at the glossy metallic effect of the chairs? the flooring pattern that is so exact.. and the neat shadow effect..

It's photoshop not vray, all those techniques are definitely Photoshopable.

That's actually a cut-out of a real chair from an image/stock photo. The flooring pattern is made with the perspective/distort tool in Photoshop, and the shadow effect is anything but neat. V-ray would never be able to render shadows and reflections as bad as this. It's just burn tool/black soft brush in Ps.

a lot of people speculating like they know the exact formula to get that done 

what about the light reflections? just saing.. it would much easier with I-render or Vray

i don't think they're as accurate as you would get with a rendering zaina.  looks like it was all kind of thrown together off-the-cuff.  not so bad that the sun is coming from multiple directions like tatooine, but it's not really trying to be consistent with angles either.

i'm guessing shadow channel from a vray render as a guide for the shadows.

I took 5 minutes to try and construct some of the perspectives and things don't always line up perfectly in the individual images or as a set. The are some interesting "games" being played with anamorphic projections and the perspectives, especially with the Gazelle's head (if these were indeed renderings).

But there are other tells, like how table textures are perpendicular to the camera, the cookbook is awkwardly placed in space on a counter, and a window swings open at an angle to a wall.

But as chigurgh said earlier, these are essentially montages that are constructed in a fashion that is similar to photographs made by Hockney. I added Ames, and you could arguably trace this back to some of collage work of Mies. The filters and added textures depend on what brand of glue stick you like to use and whether or not you use left handed scissors to cut out the images (eg. designers technique).

But you should just go to their site and look at the images closely. There are major tells in how they construct images. 

Hi Lina!

I believe there are multiple methods to achieve this type of result, I can however recommend the one I've been using the most.

After building up basic geometry in Rhino, you can set the scene, use the command make2D and export it either to Photoshop as a pdf or Illustrator as a vector. This gives you a guideline for selecting areas and masking textures.

I have recently released a collection of artistic and painterly collage textures - maybe this could help as well (recollage.co)!

All the best,

Aga