In a dim light room with a dark floor and your pretty cool tone walls, I would plan on adding some warm,even if "neutral" accents. & I would want that shade or a variant to appear in the rug. Note for example the addition of the caramel leather and accents to the creamy and cool here.
But what is your style? Trad,modern,neo-trad,beachy,boho? Curtain wise, keep the volume nicely stacked back (that's the #1 reason for putting the rod 10-12" outside frame) to allow maximum light. (as above) Not the sheerness of the fabric. Again,let us know your style for more targeted specifics.
Q