What is this scene for? why are you making it?
I’ll go ahead and assume it’s practice either for arch vis in general or bathroom brochure specifically…
In either case, composition and lighting are the BIG flaws here… then I’d say it’s the lack of observation for all the details that others are pointing out…
Arch vis or a brochure should be aspirational, they should sell us on a concept (like all product renders)…
It’s no accident that cans of cola or bottles of beer are often on beds of ice with condensation running down them… it helps us imagine how cold the contents are, how refreshing it’ll be to glug one down…
… and the colours are usually bold and appealing… they’re trying to get us to picture what it’d be like to have one right now…
In archvis a room with no windows or doors is just a box… we are drawn to natural light… having a door or window letting light from elsewhere into the bathroom can allow for more interesting lighting scheme here.
Sell us on the design features and have a greater sense of mood to make us feel good looking at your picture, to make us wish that we had a bathroom as inviting as that…