sectionals are rarely recomended. how many of you are there on a regular basis. will you need a table and chairs for games?

You might consider moving the sofa to be centered in front of the window and put the chair nearer the door adding a pony wall height bookshelf (with its back to the chair), with or without doors on the entry side, between the chair and the door to create an entry; perhaps something like this: http://thegamersforce.com/ikea-glass-door-bookcase/bookshelf-inspiring-low-bookcase-with-doors-bookcase-with-doors-ikea-dark-brown-bookcase-with-glass-glass-door-ikea-bookcase-singapore-ikea-glass-door-bookcase-ikea-billy-bookcase-glass-door-instruc/ A barrister style bookcase could also work. Such a room divider would give you a place to add a lamp to the room.

A sectional probably isn't the best bet for this layout. Keep the TV on that wall, but get a lower console (and a wider one should be 25-50% longer than TV). A sofa and two chairs would all for better traffic paths and feel more open.

Something about rectangular shapes [of windows] and several together -- fp item with irregular shape [cause it's sculptural] -- adds interest. There'd be another spot for art - the opposite wall where there's nothing right now. Maybe large canvas, and it could have contemporary vibe if it's the thing, the main thing in that area... have at it on a store-bought canvas: you with a color, and him with a color!!! ;-)