how many people usually use the room? and do you prefer to sit straight or to lounge? if you mostly prefer to sit straight...and it's your main living space in the house where guests of different ages come etc..push the sofa closer to the window..(since the bookshelf is not staying)..two armchairs facing: one, the TV, another, the sofa..kinda angled, like they're having a conversation, you know? the coffee table gets to be in the middle.and you can add a side table between the chairs. maybe something round, so not everything gets to be rectangular etc. I'd definitely put TV lower either on a console ot over the console. in this scenario TV stays where it is but you get a) much better viewing angle b) storage c) simply nicely composed space. It can still swivel so you don't loose that function. The console should be longer than the TV. If the mirror stays over the sofa it needs to be lower. The rules of art and mirror placement change when they are over the furniture..they should relate to the said furniture. There are guidelines, but generally you can eyeball it ..if it looks good then it's good. If strongly prefer to lounge..then instead of sofa you can get a sectional with corner part under the window. You might be able to put a chair on the other side of the coffee table, depending on how big or small the chair is..you don't want to cramp it too much. If no space for a chair-consider switching your coffee table for an ottoman (don't match exactly to a sectional). can serve as a coffee table very easily if you have a tray on it. But can also be used for additional sitting if you have company..especially kids love these. You can have a side table on one or both sides of the sectional, depending how much space you'll have. I'd definitely add some lights. A table lamp. Or a floor lamp. These are food for specific tasks like reading or mending; they're also create pleasant ambient light. You're more in control of your lighting thus mood you want to create, and function you want to get depending on what you do, if you have different lights on diffrerent levels. I love your curtains and floors and a rug..and a dog..:) It will be a very cozy room

Not sure what you want the drawing shows all those things Maybe just a regular detailed floor plan will help.

A living room. Right now we are using it as a empty play room but would like a living room. This room is open to a family room where we have a tv over fireplace and sectional. I am replacing the sconces with more modern ones. Also, the furniture that is currently in this room would go down to the basement. I envision reading in the room, entertaining/sitting, and also having the kids play?

Very similar to our last home. When the plywood decking was down before flooring went in, I measured and drew island out on the floor and used a large cardboard box to put where the sofa with sofa table would go. Then DH and I marked under the "sofa" for the outlets. Your electrician should do a walk thru with your to discuss outlet and switch location before the rough-in. The large window, is there a view you want to face? Or the other wall of windows, does that open? View? With range wall, island and then table/chairs all in a row, I would want to break up the lines by doing the sofas or sofa/chairs in the opposite direction.