I don't know what Revere Pewter would look like with the browns you have, but I've seen pictures of it with walnut and calacatta marble and it look very nice. Buy a sample and paint a board with several coats and set it in the room to see if you like it. It is a Benjamin Moore color.

I wouldn't paint that brick. Lime wash is (mostly) for unfortunately colored brick. Yours already has a similar lime wash look and it has a really good colorway. Get a designer to suggest some new ideas for the trim/shutter/door color. Try taking off the shutters to see if that helps give an updated look/feel.

Painting the cabs to a high standard is an investment in both time and money I would not do in a rental. Also, is the owner supplying the paint for the walls? As a landlord and a former renter, I would make sure that any colors chosen get the owners approval first. As to what shade could work best for you on the walls, can you share more pics? Agree with you that the current shade isn't working. And I would most likely paint out that bit of white trim to match the new wall colour, if the landlord approves.

Any recommendations for colors? I was thinking Dark Grey? Need to make sure it goes with the siding and door Color. Thanks!