Brilliant as ever Zuliban, great to see you posting here again.
My only comment for improvement is on the last image. The concrete panels look great, and I love the reflection, but there are some visible seams and some wierd circles in your texture map. Other than that, I love it!
great work, exept 2 things that botherd me:
1 - a lot of images seem to have issues with aa.
2 - most of the images have noise. If thats acceptable by the client thats fine, but imo the noise is a bit too much.