It really works best in cases like this if you paint everything the same color. The tile looks green in the picture. Have you sampled Classic Gray next to it yet? If it doesn't work out, look at November Rain or Old Prairie. They have a little green in them. There are also others that might work if those two aren't the right shade of green. It's hard to tell from a picture exactly what will work.

I was going to give the same advice as kandrewspa. I would find one color that works with your tile - and use it for the whole room.

I've read a lot of advice about lightening the color for the ceiling by 25-50% because it will look darker on the ceiling (horizontal surface) than on the walls (vertical).

Will you add some photos during the day with natural light?

I agree--keep it all the same color. We used BM Swiss Coffee (which is similar in formula to Simply White but with higher percentages of each color) and although everything is painted the same except that the trim is in a satin finish, the ceiling does look different from the trim and the walls (lighter, in our case) just due to the lighting in the room.

If you do decide to do two colors, I'd do all of A/B/C/D/E in the ceiling color.

Yes, keep it all the same color. You can lighten the flat ceiling parts by 50% as they will catch some of the color from the walls reflecting upwards. Beautiful tile job.

You don't show what is on the opposite side for the tub ceiling so not sure if you would be hesitant to use all the same color. I think all the same would be a nice relaxing look. If you prefer some white above the tub, I would paint C, D & E in the white so it covers the tub area. There's no visible lighting for the whole space so maybe needs to be considered too.

All one color and that has to work well with the tile , I might just match the grout to be safe .

The sheen used will also affect whether the paint looks lighter or darker on the ceiling. If you use flat/ceiling paint on ceiling and eggshell on walls, the flat/ceiling paint will reflect less light = look darker.

I will also just plug BM Aura Bath & Spa, which I love for bathrooms. It is a matte finish (only comes in one finish) but it does a beautiful job in damp spaces. In our particular bath, using that on both ceiling and wall in the same color resulted in the ceiling looking lighter than the walls, although often it is the reverse. I imagine it depends hugely on the lighting, but I debated lightening the color by 25% for the ceiling and am glad that I didn't.

I'm not sure how either of these paint colors relates to the finishes in your room.

I used Simply White on the ceiling and Classic Gray on the walls and the beam.

A color that relates to the finish on the tub and toilet would have been expected IMO.

I think it's just an artifact of the lighting in the photo and the fixtures are actually white (or possibly ivory?)—but OP can confirm.

Looks like Biscuit to me.

The tub color looks nice with the tile, so I would match that color and paint everything in the room, including trim. Use semi-gloss for trim and matter for walls. I also like Aura Bath & Spa.

Match the tile and the wall and paint that whole area one color it will fill bigger brighter and you won't notice all the different levels it would just be more open and maybe if you have a plant in the bathroom it would really look nice