Hi, you can nicely put a beautiful runner on the center of the table, with placemats, bamboo tray with all accessories like salt and pepper, paper napkin, nice cutlery, LED candle, you have lot of options. check pinterest for more designs.

you can go for wall mount full size mirror next to the computer table as converting it will not give good results

Hello Sagar, This space is sufficient for a bathtub in a bath. Thanks, Nitin CORNERSTONE DESIGNS, Bangalore

Hi Shivam, I hope you are doing good. There is no particular tile size that may look good as it completely depend kind of design you have in your perspective. If you are looking at more traditional interiors then generally smaller tiles with motifs or emblems look good which have a representative geometrical or floral patterns. If you are looking at more modern interiors then generally bigger tile sizes are preferred for clean look less joints.  Regards, deSigneR