It looks good in your inspo photo and will be nice in your similar bathroom. Large wall spa art with cool grays and warm beige will tie the warm and cool tones in the room. I found art for you that I positioned for context only, not size or position. Link provided.

https://www.art.com/products/p42411555769-sa-i10107635/jean-carter-usa-oregon-cannon-beach-fog-rises-over-coastline-at-low-tide.htm?upi=PYQVC70&PODConfigID=13929613

Based on the photo you shared, it looks like BM CSP-105 Smoke and Mirrors is a neutral color with warm undertones that could pair well with a variety of tile colors. While the tile in the photo is not gray, it still complements the paint color nicely.

When selecting a paint color to go with your bathroom tile, you want to consider the undertones in both the tile and the paint to ensure they work well together. If you're unsure whether CSP-105 will work with your tile, you could try getting a larger paint sample and taping it to the wall next to your tile to see how they look together in natural light. Alternatively, you could consult with a professional color consultant or interior designer for advice on selecting the right paint color for your bathroom.

Regarding your unrelated question, there's nothing wrong with reusing the same color in different spaces. In fact, it can be a great way to create a cohesive look throughout your home. Just keep in mind that factors such as lighting, surrounding colors, and room size can affect how a color appears in different spaces. So it's a good idea to test the color in each room you plan to use it in before committing to it.

The proposed paint colour looks like quite a different tone (cool) compared to your tile. You can of course choose whatever makes you happy but I would choose a warmer colour more connected to your tiles.

Yes - you can repeat paint colours around your home. It does make for a cohesive look.

Best to put a big white white paper behind that paint so you can see it in isolation with the tile. It’s much too ‘taupe/purple’ grey where your tile is warm beige leaning yellow/gold. And we can’t comment about other rooms and repeating paints - same floor? What other finishes will be there?

I'd purchase a larger sample here: https://samplize.com/products/smoke-mirrors-csp-105-12x12

Tape it up instead of peel and sticking it to the wall. Look at it in many places in the bathroom, including areas near a window and areas that have shadows. Place it near your sink and toilet to see how it looks next to those materials. When you do this, put a white piece of poster board behind it so to block the distraction of your current paint. Take lots of pics and then post them here again. To my untrained eye, I think they look great together but I'd want to see it in larger swatches and other areas.

I love gray but I would not paint a bathroom that dark at all. I also would make sure the lighting is not skewing the colors I like LED 4000K in both kitchens and bathrooms , Waht is the bedroom like IMO that drives the bathroom colors for sure.

Sorry, to me it doesn't look like it goes with your tile, and it is a very dark color. What you have on your walls now is also pretty dark, but it looks better than Smoke and Mirrors would. If you're just tired of what you have and looking for a change, consider going lighter. I used Pale Almond OC-2 in a bathroom with similar tile in my previous house. If you want to stay with a darker color, look at Smokey Taupe 983. I can't be sure that would work because colors can be deceptive on monitors, but Smokey Taupe has some red in it which might be better than Smoke and MIrrors. Your tile has a peach undertone.

Thanks everyone for your advice and thoughtful responses. I will continue to explore options and use white paper background as suggested.

Regarding repeating a color, it would be the same floor. Color in the kitchen would be used in half bathroom. In general my house is painted with BM Sea Salt except kitchen (BM Museum Piece), bathrooms (various) and master bedroom/bath.