There's just me living in this space. In the 4mths I've lived here so far I haven't had to clean the tiles on back wall but it is dark so maybe I can't see the mess. As for the sink area there's water splashes always on the tiles. The kitchen designer advised me against using the mirror here for that reason.

This house is getting the death me! I’m sure ur sick of the question lol I will send u many photos once it’s done! Kitchen company said where we both agree. Other people think in the middle but it agree . Thank you for all ur help :)

As a glazier myself, that advice is correct, however non-toughened mirror is significantly weaker than toughened and the kitchen is not really a place to be taking short-cuts with glass, especially if it comes right down to the benchtop. Also, if the splashback has any notches, powerpoints or other cutouts in it, your glazier will insist it is toughened. Hope this helps :)

I think the look you are going for is gorgeous! But I admit that I too am surprised your considering a smoky mirror splashback if you dislike glass? But again, it all depends on the vision you have for your kitchen. As Dr Retro has wisely pointed out, depending on what is opposite, will depend on what you're reflecting... or, what you have on your kitchen bench and if you want to see it doubled. I think in certain applications, smoky mirror splashbacks can look really beautiful but if you're not fond of glass, why not start with a material that you love and go from there? I have developed a bit of a thing for Southern Cross Ceramics and all the different tiles they have available - in beautiful colour tones, patterns.... aaaaah it's hard to make a decision! It doesn't need to be a dark colour if that is not where you heart lies, but some soft muted colours could work beautifully. I also saw a designer recently laid I believe it was a mix of matt and gloss white subway tiles in a herringbone formation (correct me if I'm wrong anyone??) so that it had a little twinkle here and there... it looked beautiful. As much as I love a mostly white kitchen, I think a little colour & texture that compliments your marble would be a great way to go.I even saw some silver/copper foil looking tiles as part of a splashback to give a kitchen that bit of glam. Before you commit to smoky mirror splashback, maybe have a look at some other options that will compliment your style and see if anything else grabs you :) Good luck.