In my opinion the white seats and sofa and that too small table in white are too much contrasting the dark grey modern fireplace (which I like!) . I would choose the same grey for the suite or the same brown like the book shelves and pop up with cushions in red, yellow, green (if the red carpet stays). The table should be much bigger, and eventually some kind of a simple rustic style to break the modern clean lines. The fence and deck are of gray colors, so I think the living room /seats in grey would match the outdoors too, even let the living room look like part of the deck or vis versa ;). If my ideas are too grey-ish for you, why not just hang colorful art on the big wall and the rest leave tone-in-tone.