Ok are we talking architectural designer or interior designer? Architects are more about lines and form and they grumble about the interior designers but that's who they hire to do the color boards. Either way you are the client and it's your house. It may be a great color scheme for the design but if you don't like it change it. Those sample of paint are worth every penny because you need to see more than a little chip. With your asymmetrical design you have room to vary more than the usual field or base color and a contrasting trim. I'd make a tracing of the design and copy a bunch of pages of it to use as a coloring book. (yes use crayolas:-) Another shade from the same shale grey paint chip and a one more accent color would be a good bet. If you are going subtle neutral, make it 3( not 50) shades of grey and play with where you put the darks and lights. Remember sunlight and shadows will create alot of contrast for even a "pale monochrome houses. (the computer rendering doesn't give you that.) You could add a pop a smoky teal, plum or coral if you want color as bold as you design. These would just be accents or trim. If shale grey it a really light silver you could make a monochromatic scheme with blue grays and a navy blue door and trim. The tan/beige in the rendering needs a darker grey to work. I would keep my midtone color on the lower level and a lighter shade on the second level. The top part that pop out could be a bolder accent color withe rest of the upper level almost white. Lot depends on your roof and window frames and whether you want them to blend in or pop out. Try a bunch out on paper or one of the computer programs before choosing any changes.

yes to all, we did have the tiles professionally sealed, but sealing is not a cure all in my experience but I'm sure it helps considerable . my wife does buy those hand made goats milk styles soaps etc and I don't imagine there is anything more testing for stone, and yes it does mark. The Grey ( bane of my existence )granite much more so than the beige travertine ) I must admit though, the kids bathroom was almost non existent as one has sensitive skin and uses pump pack. I would also imagine climate, airing/ sunlight, volume of use and the time you have to manage it would also be contributing factors. We are way short on time and they don't get the attention they deserve, so I would suggest asking around, others may manage it better and it not be an issue. If your only doing your bathroom you may consider the risk factor not worth it for the volume, but for me, the advantage of travertine in the rest of the house far out weighs any marking issue in the showers, and wont stop me from using it again. To be honest when we sold the last house I just took to the shower with one of those paint scrapers with the razor in the end and most of it came off and it didn't detract from the look of the house. Sorry i have probably only muddied the waters even more, good luck with it.

Sorry to keep you waiting. Busy as crazy doing another bathroom in the house. Hopefully the last for a while. Yes it is paint behind the vanity. After much deliberation I went ahead and painted it. It is easily wiped down for any accidental splash back but unless your bathing in your washbasin there’s hardly ever any The floor tiles, and in fact all the tiles are from Moorabbin Tiles. Polished porcelain. Thank you for your kind feedback

You are going to have to spend some money to make it look seamless. Doing it cheap will always make it look like a crappy addition. There is no easy, cheap solution to your problem, and you will regret it as soon as it is finished. Best of luck, Dr Retro of Dr Retro House Calls