I would remove the cover you have on table right now. Just wondering if your furniture is Japanese , just curious :) also details of windows seems to have some Far Asian influence. I would brighten the table up with a bowl of flowers to match the scene, chair covers too with tie backs, table mats, and rug under table. Try to colour coordination table accessories, chair cover, rug and curtains. Center the table in the middle of room and add sideboard near window or corner display cabinet.

In that space you will only really have room for some seating and a DR table and chairs I would be looking fo a long low shallow unit for the media pieces and hang the T.V. on the wall 10.5 ' is very narrow. The room in these pics is almost exactly the same size as yours , if you see where the empty fireplace is that is where I would put your T.V. and then wap the bench for the sofa .

By placing the tv on the longest wall on left and placing the couch parallel facing the tv you may have room on the back of the couch to put a long table or preferably a chest with drawers..this would add always needed extra storage at the handy location at the bottom of the steps..this concept creates little rooms within a room and enhances the spaciousness of the open concept hall

Let your wooden beam be as it is. put your Led lights in the other direction ( two on each side in one rectangle , so the total will be 16 units of say 10 watt each Led.), as to balance the horizontal and vertical shape. Don't put anything on the wooden beam to retain its the beauty.