Great images there really isn't too much to comment on.
My biggest suggestion would be to drop in some background enterouge between your scene and the the sky. The exteriors are are superb, but there is nothing grounding them to the rest of the world... you have the focal house, the surrounding enterouge then it breaks and goes straight to the sky. Almost as if your scene is composed in an empty world. A distant skyline or treeline would be the last missing piece to a great image.
On the last two exteriors: I would turn down the displacement distance on the grass. It's turned up so high that it looks unrealistic.... I would suggest trimming it up, someone falls in that yard they might impale themselves
The only other comment would be to lose the frame stamp. Personally I'm not interested in what rendering engine you use, or how long your rendering took. I feel that a good illustrator can work his/her magic regardless of what software they use... and a good image isn't about how you did it, its about the end product. If you are going to take the time to watermark the image with your company logo and call it a final, then take the time to turn off or crop out the vray frame stamp.
all the same it's a pleasure to see quality work.
-bk