First, I would repaint your kitchen- 2 shades lighter than your living room selected from the same paint chip card. Then, I would chose a large scale print curtians in black and white or black and cream. (Ballard Designs Concorde Medallion Panel) I think you could use some pattern!
It would tie in the counter and the black wood in the rooms as well. Also, when you hang pictures on the wall, they should be eye level. I also advise clients to put family photos in a beautiful album : on a shelf or the coffee table. Your little one is probably drawing. Blow up some of her "art" and find some sale frames. You wouldn't believe how artsy it can look with a nice white mat!

I largely agree with the above - This is essentially one large room, so treat it as such: Same paint throughtout and same windowcoverings throughout.

Your home will feel much larger and more spacious as a result.

Window treatment in corner of room: