It would be so hard to suggest any decor ideas without knowing what you like, your style, what colors whould you prefer etc. Can you please give us a little more info?

I would change the door knob to a brushed SS (or whatever your toilet roll holder is) lever style and get a new shower curtain, maybe like this. It depends on what your budget is. New paint could help a lot, but I cannot see much of the sink or any of the mirror.

It's so white - I think I would inject a little color. Not a lot, just a little.

I like the wall color Beverly shows but I respectfully disagree with the geometric shower curtain because I think it’s fighting with the geometry of the floor and shutters. I’d go for something more floral or vine-y or just solid.

I’d get rid of the wall clock, hide the toilet brush, and get a prettier wastebasket. (Can it be tucked away in the corner behind the toilet?)

Can we see the sink wall — mirror and lighting?

I wouldn’t go industrial chic in your bathroom because it’s a standard bath and the fixtures you have don’t really fit that style. It looks like you have kids, so I’d make it light, airy and cheerful. Find a fun shower curtain in colors that you like, pull one of them for the walls and others for the towels and accessories, give up the clock, add some art, maybe something with a little humor to it.

I found these on Society6, they’re just ideas for color combinations you could use. They have 100 pages of curtains in every style and it would be a good starting point for some inspiration.

Gray walls, apricot and blue accessories

gray, light green and dark green

Plum, gray and coral

I like your shower curtain and wall paint color. How about a runner rug in colors you like? Also, it might just be the angle of the photo but my eye goes down to the shutters right away. Something above the shutters would draw the eye up and in. Maybe three square prints?

It is a fabulous blank slate!! I would be looking for a shower curtain to die for and call it good. Maybe find something a bit more fun than the clock for the wall? It appears you have a little one. I would want a bath mat to prevent slipping after bathing.

it needs some life, colors or some cool hardware.