Here are some suggestions:
1. Lighten up the ceiling with an opaque stain so wood grain is still visible. Leave beams exposed.
2. Replace ceiling fan with a drum shade fixture with light shield.
3. Add patterned area rug with green wall color and lighter background.
3. Go with more tailored sofa with open base. Mid color range.
4. Wood arm accent chairs.
5. Dark round ottoman for contrast.
6. I would go with a light wood/white media cabinet that is more narrow than your existing one. It protrudes too far into the room.
7. Add sheer, light colored drapery panel.
8. Light wood end tables with beefier green lamps with light colored shades.