Thank you for your comment Sam !
I have updated my post and added a new picture.
I have big difficulties to get larger image. Each time I resize Octane window it crashes.
I have tried in dual view with the Node inspector on my right screen, but my 8800 GTS 512
is not enough powerful with that screen expanded, and It freezes. I even got a complet
computer freeze (requiring hardware reboot).
I like a lot the first kitchen image!

French Blender user - CPU : intel Quad QX9650 at 3GHz - 8GB of RAM - Windows 7 Pro 64 bits. Display GPU : GeForce GTX 480 (2 Samsung 2443BW-1920x1600 monitors). External GPUs : two EVGA GTX 580 3GB in a Cubix GPU-Xpander Pro 2. NVidia Driver : 368.22.