Desperately seeking answers....a colour quandry

 Today was spent doing more painting....and finally the last of the upstairs ceilings are finished. Phew!
I have been told by 'the boss' David, that I am NEVER to design a house with these style of ceilings again. LOL. ATM, I don't think I want to design a house again, EVER.

 The time to commit to the wall colour has now arrived.
They are currently undercoated in un-tinted white which is very cold and stark. I'll paint most of the walls in the same white I've chosen elsewhere in the house; Dulux Natural White (ceilings are 25% strength). I want to break up the cavernous open plan area upstairs by adding charcoal features (Dulux Domino) and also to tie with downstairs.
It's just the where to start / stop issue that's making me nervous!

 Feature walls look best when used to highlight a single wall with no openings and paint starts and stops in internal corners. I'm wanting the feature walls here to be dark to recede them and to delineate the hall as a separate entity to the large lounge room.
I'm happy that the contrast achieves this in the renderings above.

 I also want some WOW factor when looking up the stairwell from the entry, to the main living above, so had planned that shallow recess to be dark too...

See the little nib wall on the right, above. According to 'ideal plan' it should be white but does that look odd? Unbalanced? Help!

And is it too much ?

 I had envisaged the end wall (with the two windows) and seen below, to be charcoal too. Eeeek!
I am SO overcome with indecision!

Some more deets: The floors are to be a wide plank, light to mid toned oak. The kitchen charcoal with a white island. A large dark hued carpet square will be inserted into the lounge room where there will be white slip-covered sofas. All of those dark walls will have substantially sized artwork on them.

Here's a plan, the RED lines showing where I'm considering using the dark wall colour.

I would dearly like your input on this...and be forever grateful!
...if you've never commented before,
or do so regularly,  
PLEASE share your thoughts!

x KL 

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