Hi Jamie,
I think we need a bit more information about what you are looking for. Curtains? Paint? Rug? And about the colour of your sofa and the walls. Colours are hard to judge from a computer screen.

Where do you enter the room from? I would wallpaper the wall opposite the entry point of the room (so that when you enter the room you look directly at the wall with the wallpaper and it's visible when you're outside the room from other rooms). Choose a wallpaper that's bright and daring in contrast to the other items. For example, you could do a geometric print wallpaper (or even a damask) in the same aubergine tones of your pillows and throw.

Assuming the sofa is black and the walls are taupe I would suggest a deep red to accessorize..
pillows, curtains and throws.. it should all tie in nicely.

Your dark pillows are getting lost on the dark sofa. You either need to add a light one, or put a light ( wall colored?) throw behind them. You picture arrangement needs to be spaced out more, to cover more wall space (start closer to the top of the sofa), it would be great if you put mats that were your wall color around each of them, and thicker frames.

Few changes need to be made for balance. Your sectional is dark and large compared to your small grouping on wall, skinny lamp, small accessories on table, and dark pillows and throw. This unbalance can be fixed with a few larger pictures added to the grouping...a lamp base that has more volume with a larger shade...fewer and larger accessories. Switch out pillows and throw with a color/pattern that makes the room stunning. That is the role of accessories. The wall on left feels neglected. I would wallpaper with an updated geometric vinyl that ties our couch wall with the TV wall.

Everyone's suggestions were very helpful! I'll start my shopping tomorrow and post updated pictures soon!