The models don't look bad, I'm not really into the whole metal and perspex theme going on. But that's your choice.
What renderer are you using? The lighting could do with some increasing, and fixing.
As for the couch, it has the right general shape, but it does seam a way bit off. The couch in the photo isnt seperated into the cushions, and it is alot smoothers and bulges outwards in the mid back. Also the material seems reflective and too dark (as with all the other renders).
May I suggest the tutorial made by Terry at
http://terryfera.onnovanbraam.com/ for creating a silk material and change the colour and roughness?