I find the tiny hexagon tile rather ugly.. Sorry..

The mosaic would make a statement on one wall, like the shower wall.

I'd go for a really light grey floor (sand-ish) and maybe slightly darker wall tiles. Smooth ones.

All depends on the space itself and the style you want to achieve.

Grey large format. Less grout lines is ideal for surfaces that are subjected frequently to moisture.

I'm a little lost too. The tiny hex as accent? It looks somber and industrial and should go on a floor in a public place, not a home. What are your plans for the large hex? That's an accent tile.

The 12x24 tile that has the small hexagon has an identical tile that is flat( at least at one of the tile stores I go to). I think that if you use this tile and the mosaic it will be be busy. I would use the flat version of the 12x24 hexagon on the walls and do a strip with this 12x24 hexagon. You would add some texture but not looking super busy. For a Mosaic like that I would go with a clean flat tile instead. I read that you really loved the mosaic, and sometimes we fall in love with many things, they just don't go together well. At this point we have to decide which one we love the most. Dont worry, that happens all the time. I did this project with the same tile but using the flat version and only one strip around the tub. Good luck!