You have pretty things to work with, Love. If you find a seagrass or neutral type rug, a pretty patterned chair would look so charming! You can accent with patterned throw pillows as well. Do you have something that could be used for a focal point? Maybe your piano?? As "Bannie" mentioned, I have a similar room and used a faux FP as the focal point. Then I added a round mirror and small sconces. Excuse my old pix, but hopefully they will help you. This will be such a fun project for you!!

That table could work.I like it better with the blue Oushak than the red Heriz, though. You're asking for a casual look in a room with fairly ornate furniture, a crystal chandelier, a great big fireplace with a Moroccan mirror, traditional lamps and bookcases down the hall. I'm not sure it's possible without starting over. Besides, I don't find traditional tribal rugs particularly formal.

Could you center the couch w/ the window and move the chair (angled) to the opposite end? That way, someone could see the tv from the chair as well.

Just some random thoughts: a) don't think you can push the bookcases together without altering the molding at the top. An alternative is to separate them and create a bridge over top which could span a love seat...add lighting into the top of the bridge. b) I'd group the furniture around the window and the solid wall so as not to have to put a traffic pattern through the center of the conversational cluster c) recessed lighting can be unattractive unless it's used near the edges of the room with deliberate purpose to highlight drapes, artwork, etc. They do make smaller cans now too that I think are better looking. But good lighting is essential to making any space look well and functioning well. But if you are having electrical work done, you might want to do a good layout and then look into have a floor outlet added so you could add a lamp and side table to a chair or two that would float in the arrangement d) that large window is lovely but looks like privacy would be an issue at night so consider drapery treatments for it and how that might work with your plants. Also, depending on what region you are in, insulating needs might be an important consideration.