I agree with round rug. How much colour are you after? The blue chairs are beautiful. I love this colour. You could add some touches of green- think olive or lime green depending how bright you want to go. Two different looks. Orange, yellow and mustard yellows will go with the navy as well. Is the black furniture staying or will it be replaced? A blonde timber based tripod lamp could soften the room too but stick to a darker shade. Good luck.

This is beautiful, love the use of the dark floor, wallpaper and a touch of blue in the chairs. Well done!

Your room is so light and bright, you have a wonderful balance of colour and neutral already! But you have a lot of light colours that make the room look as though its 'floating' and you have an impressive art and objet d'art collection with red and bold colours - so I actually think a couple of small accent chairs in a dark cognac leather or vinyl would work well and anchor the scheme, especially if the chairs were an open-arm timber design (like below image) so the timber matches with your existing TV cabinetry and coffee table and the open arm design does not look so heavy. Also you have nice high ceilings so I wouldnt go for a chair that was high in the back, this would throw the symmetry of the room - keep the accent chairs about the same back height as the sofa

I am thinking above layout with below options are accent chairs from castelry link https://www.castlery.com/au/products/desmond-leather-armchair X 2 are bar stools from temple and webster https://www.templeandwebster.com.au/65cm-High-Back-Luca-Beech-Wood-and-Rattan-Barstool-TMPL2167.html X4 are some black colored buffet and i will have a wall hung tv on top to go with it . buffet eg https://www.templeandwebster.com.au/Poh-Rattan-Sideboard-Buffet-TMPL2888.html?piid%5B0%5D=200481815 tv i have is exactly like this ---> https://www.google.com/imgres?imgurl=https%3A%2F%2Fi.etsystatic.com%2F29185185%2Fr%2Fil%2F09c361%2F3180911202%2Fil_570xN.3180911202_pa1i.jpg&tbnid=S8UN0RJnuuzvnM&vet=12ahUKEwjouK3_wvb9AhW50XMBHVpJDaEQMygOegUIARCfAw..i&imgrefurl=https%3A%2F%2Fwww.etsy.com%2Fau%2Flisting%2F1045281671%2Fsamsung-frame-tv-art-file-minimal-beige&docid=1mtj9SnXdxfqXM&w=570&h=433&itg=1&q=samsung%20frame%20beige&ved=2ahUKEwjouK3_wvb9AhW50XMBHVpJDaEQMygOegUIARCfAw dinning chairs may be https://www.templeandwebster.com.au/Hans-Wegner-Replica-Wishbone-Chair-ADWISNTT-TPWT2441.html or https://www.templeandwebster.com.au/Black-and-Natural-Replica-Hans-Wegner-Wishbone-Chairs-ADWISBKN-TPWT2500.html or https://www.templeandwebster.com.au/Daimyo-Velvet-Dining-Chairs-MF1887-MAFU1061.html X6 rug may be https://www.templeandwebster.com.au/Kendra-Grey-Power-Loomed-Rug-KEN-1731-GRY-NETW7197.html rug under table may be https://www.templeandwebster.com.au/Natural-Jasmine-Jute-Rug-ATR-BKR-NAT-NETW5049.html Please feel free to comment on layout and furniture choice . I have used temple and webster as they have many designs . Please feel free to add other suggestion as well I really need help as i am very bad with thisstuff