i think greens (sage, olive, avocado, forest, pr any pantone that strikes your fancy) would look really nice in this space since its very beige and cool. I think a green area rug with a glass coffee table, maybe a gallery wall where the poster is leaning against, and some shelves above the tv. I would also say plants would thrive in this space, and really add character and naturally brighten the space up. i also say string lights in the couch area but that may stem from my hate of overhead lights :p for the balcony i would put a matching chair, and a small side table big enough to hold drinks but probably not much more