hi
you have a really nice place that can be designed in many WAYS i tried to give you many solutions in plans 2d and tried to do some 3ds to express some of my ideas
i depended on natural light colors so i used terrazzo in a cream tone and KitKat tiles for wall and floor
i also used wood and marble for the sink, and the sink vanity and I added some storage above the toilet
i removed the wall in all the designs i did to make you feel how much your space is really spacious and open
i suggest adding a lot of spotlights to get more light i also suggest hidden lights behind mirrors and in the storage above the toilet