You can put the TV over the fireplace, not the best situation but the way the room lays out it is the only logical place to put it. If you could you should add one additional layer on your mantel that could extend it out another 4" to deflect the radiant coming from the fireplace. I would also mount it on a slimline mounting bracket and have the bottom of the TV no further than 4" above the mantle. Ideally you want the TV to be in as straight a line as possible with your eyes. You don't want to look up too high at the TV, it's like being at a sports bar. Also if you can snake up the power and the HDMI from the cable there is a box they make that has both in one so it makes for a very clean installation.

What a fun space! Love the pillows...I agree with above, lower all the frames, but not so low little ones can reach. The art should fall at eye level about 5'4" for walls and for behind the sofa not more than 12" above it. Then keep the width about 5" inside the sofa length on each side. Your frames are small so you need the close together for impact. I would start with some pretty curtains for the door and large window and then a simple Roman shade for the small window- since your girls play there you don't want anything they will grab hold of. http://www.houzz.com/ideabooks/query/how-to-hang-a-photo-gallery

Thank you for ideas the room is little dark in day but I love the night effect, we are repainting so could look at half the tone of current colour, the chairs I have in the room are silver. The photo does not reflect this, wonder if gold would be odd the stone sofa has metal legs, the house is 1970 ContempOry but I love to mix old and new, and wanting elegant French look, what type of comfy chairs should I get to match sofa and where would they best fit, do you think the armoire go next to fire.? with our old settee should I keep this single chair but cover it? I wonder if it too bulky? Also the leather chair is brown should I keep this in the room or not. the mirror above chairs is silver and gold frame should I shift it /paint it /leave it and add tall lamp in this ares to make reading corner, and can pull in chairs when have guests? The oak cabinet is a keeper have I got this in the best position, I appreciate all ideas.

Try the TV where the sofa is now and float the sofa perpendicular to the fireplace where you currently have the big chair. Perhaps the big chair can then go where the TV was for a quiet spot for one. Or even better, pull the loveseat off the wall and put the big chair to its left flanking the fireplace.