Going with the theme your are trying to achieve, I would add a black leather ottoman to replace he white table. The built in shelf I would remove and sheetrock over it or paint in a matte finish black. Before you paint in black be sure your have accessories such as silver or reds to put in that space to set off the black background. You can put a series of pictures with silver frames or art objects of silver , red or combination. I love your table and chairs.

that's a fun and funky table! Not for me .. but I'm sure somebody is going to love it!

Leather sofas can really dominate the room and can give an overall cold feeling. I would add some earthy elements, like a wood coffee table with glass or metal. Go to Restoration Hardware's website and look at their sofa room scenes. And I'm sorry I think the art is too harsh for the room. That's all your eye goes to in the room. too overpowering. I would look for something softer or maybe a cool mirror and I would add color to the room with pillows and some colorful lamps. I also think woven blinds would look great. They add warmth and give a finished look. The color of your window treatments should contrast your wall color a bit, not match it or else it starts to look generic and blah.. You have warm walls, warm floors and the woven blinds, like Hunter Douglas brand would pull it all together for you.

that is what i have added if you can see the pic above.. want some suggestions on partition that i can use between dining and sitting