Sounds like your daughter's already got some interior designer instincts ;) Loving the black feature wall, and you don't want to take anything away from such a strong statement, so I think you should go with white... or at least a very light grey, e.g. Dulux Lexicon quarter (on the left)...

had to check what it was... I think it will go OK but will be stark. A bt intense. Maybe the lighter shade here - light leather?

Silk would be interesting, not to mention elegant. As for paints, the Silver Illusion appeals, but it might throw green (not sure). I also agree the Tranquil Retreat is a good one. I'm wondering how big the feature wall is, and what is going on this wall, eg TV, fireplace, large artwork, etc.?

Interior decorators specialise in interior and exterior (time for a name change). Paint companies use colour consultants who are trained interior decorators on call. They have access to 4000 colours whereas you may only look at 100. Did you use an architect as they could help or steer you in the right direction in regard to suitable consultants Look on the Houzz top menu for Find a Pro in your area and check their reviews.