Very beautiful renderings you got! flawless images!
I feel the need to chime in, even though I usually never comment on people's work (I am just not fan of it, I believe everyone can be his own best critique).
So without more time lost, here is my personal opinion:
These are not good images, and if you want to improve, don't be swayed by hyperbolic positives from 3D guys. Good images aren't made purely by nice 3D models, lighting and shaders.
All this is quite easy in this time, a lot to premade content, a lot to Corona,etc.
They all have very inconsistent and chaotic feel. Completely crazy angled cameras contributes most, but pointless use of DOF and weird gimmick (the woman) don't help either.
The staffage (furniture, decorations, architectural mass,etc..) is placed all over, and doesn't leave any place for the eye to rest, neither is there any focus to something important in each image.
My eyes just wander all over with feeling like "look here..and here, but also here, all nice reflection and bump maps!" It surely does impress people obssesed with pure rendering standpoint, but the image suffers.
Take my critique in lieu that I think you have pretty good understanding of 3D and if you improve other concepts, you can take it really far :- ) But I thought you wouldn't think of that if you receive too many pointless gratulations based on only 3D gimmick. It happens on archviz forums so often that I am just tired of even looking anymore. No honesty, no reality..
Cheers and good luck !