A mirror above the sofa and art between the windows makes sense. You can reflect the pretty art and bounce light from the windows at the same time. Nice room!

I would suggest first putting the loveseat perpendicular to the sofa, putting an end table on either end of the sofa, pulling in the chair slightly from the corner, putting a console table between the two windows with vertical art above, and switching out the current coffee table for one that has a glass top. As far as the walls, because the color itself makes a statement, I would suggest some contemporary artwork that complements the room colors and also has some lighter elements (e.g. cream) in a design that is relatively large in scale but is also subdued and serene. For either side of the T.V. I would also suggest a large object in the blue color on one side and something different on the other side. It looks like it will be a sophisticated room.