Sorry took so long to update....These are some photos of the bathroom, although it was still not completely finished at the time these were taken. The door and shelves have been stained a Carbon gray gel stain that almost perfectly matches the vanity. I used 8" white shiplap through out. The wall lights purchased through Lowe's online. The mirror purchased at Pier 1. The shower tile feature is carrera marble patterned, and a sea grey tile purchased at 'The Tile Shop' in Urbandale, Iowa. The laminate wood floors are from Home Depot in Mushroom? or the next grayer color. The vanity is 60" dark grey with carrera marble top, sink, and faucet included. I changed the knobs. I think I ordered from Houzz but can't remember. It's also on Wayfair. It all looks better in person than in the photos. I don't love that the toilet is right in the middle as you open the door but I didn't want the hassle of changing the layout/footprint of the bathroom. Overall I am happy with my choices. The mirror is a little fancy to me but my husband loved it and the design echos the patterned shower tile so I went with it.

Yes it’s kind of narrow when in front of sink and mirror. It is the wall across from the vanity that gets the misjudged overspray. It’s not aerosol spray it’s a spritz. So it has larger droplets. Haha. The wall is not wall papered, it’s painted right now with a eggshell Paint. Ps. It has nothing to do with cheap or expensive hairspray. It has to do with the ingredients that causes destruction of my wall. Thanks to females in the family. Haha.

Use BM Aura Bath & Spa paint, it's much better than eggshell, designed specifically for the bathroom.

If you have a curb, you will have the cracks develop there, too. and where the walls meet the floor. Anywhere where two different materials meet or where one surface meets another that is in a different direction (known as "change of plane"). My contractor still grouts such places, too. But I did a solid surface shower that he could not do wrong. I am keeping an eye on the place where the floor meets the shower pan, all other places are in dry areas. So there it is just cosmetic. I would guess that water can get behind your tile with those cracks. If properly waterproofed it is fine, but if not, I would get to this as soon as you can. A lot of shower builders do not use waterproofing, even though it is now required. If you do a search on this forum for "Shower waterproof," you can see many discussions about it and learn what is and is not waterproof. (Redguard yes, Durock no, for instance.)