excellent room! Pull furniture away from windows a little bit. A great way to start is to put your favorite piece of furniture couch or chair, chest, lamp decoration??) in view from inside your house. So every time you through your sliding door you see something pleasing.

Like your classroom, this area should function for you, so dream a while before you shop. Ping-pong? Juice bar? Aviary? (!) Morning coffee? Then you can divide according to purpose, and conquer.

I would definitely add a dining set at the far end and a comfortabele lounger & small table in the centre for relaxing. For your seating arrangment, maybe add a small rug to make that area feel more complete and add some bright pillows. Accessorizing and painting (maybe a yellow) will also make a big impact. Enjoy your room.
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Thanks so much!! Each of you gave me some great ideas!! Thanks for your time and input!!!