I would remove that white bookcase and get a much nicer TV stand that is wider and lower to put the TV at the proper viewing height . You need lighting that is at different levels to get the best overall light. IMO bookshelves are for books and that one is just throwing off that wall If you want a bit of display for very special things then look at Besta from Ikea it can be put together to look custom and can hold the TV some storage and as much display as you actually need,As for the table and the art first do any accent pieces like pillows in a color from the art , IMO the blue you have is not working I agree a nice picture liggt would be a good over the art the table is IMO not large enough to have lamps but end tables are needed to have lamps. It would be nice to see the whole room.
Q