First, the bathroom floor...if you want hex tiles, the only reason you might not be able to use them is if you are planning on using a membrane like Ditra under the tile. Ditra, due to the nature of it's structure, limits tile to a minimum of 2". If you're going over cement board or another smooth-surface tile backer board on your floor, you can use small hex tiles. Simply ask him what his no kidding objections are to the hex tiles. There may be a real world reason why they are too small (like over Ditra) or he simply may not like working with mosaics. Find out why. For the shower floor, I usually stick to 4" or smaller, that way there are grout lines underfoot for traction. Plus smaller tile conform to the slopes of the pan without requiring cut lines at the intersections of the slopes in the pan. 2" squares are probably most common. Some people like the flat stone or pebble mosaic, but if you suffer from grout-phobia, the irregular spacing on those might scare you away. If there is a trend these days, it's toward large format tiles. They can lead you towards a contemporary design, but they can fit other styles as well. If I can steer you towards anything, look at "topical waterproofing membranes" for waterproofing your shower. Topical membranes put the waterproofing between the tile and the tile backer board, so the tile get adhered right to the membrane. It's a better way to control moisture within a shower. Two of the more common trowel or roll-on membranes are Hydroban and RedGard, for sheet membranes, Kerdi is probably the most common one. Probably the best, and easiest way to waterproof a shower these days is with a Laticrete flanged drain and Hydroban. You can wade through youtube videos or visit Laticrete's website to see what that is all about. Remember...unless you are planning on selling, I'll caution you to use tile sizes and patterns that you like, that meet the style of your house. Don't design for the latest fad, unless it's something that you really prefer. If you have trouble defining the tile size, pattern, or style that you do like, it can sometimes help to go to a site like houzz and look over bathroom photos there.

Most are personal choices. I would prefer sconces instead of pendants, just thinking they’d be less like to help me knock my head. Drawers depend on what you want to store. Fewer, taller ones if you need to store something tall. If it’s a bunch of makeup bottles, etc. then smaller drawers. I like full extension everywhere, because it’s easier to get things out. If your drawers aren’t full, then maybe you don’t need them. No answer on your edge treatment. Depends on the style of the room and your cabinets.

Looking for ideas on decent quality, reasonably priced bathroom vanities. We're renovating and adding on, so I have to pick fixtures for 2 gutted full baths and 1 newly framed master bath. I need a 72" size for the master, 42" for the upstairs hall bath, and I'm still thinking about the downstairs full bath - the architect drew a 48" vanity in the plans but I'm thinking it might be a better use of space to put in a storage tower and a 30" vanity or even pedestal sink. I've just ordered all the tile and am about to pull the trigger on the plumbing. Contractor referred us to Fergusons, but I haven't found them super helpful in terms of advice. (Covid also makes it hard to get an appointment.) Brands referenced so far are James Martin, Bertch, and Strasser. Pros/cons of any of these? Are any of the brands I see on the various websites trustworthy (Ariel, Avanity)? We redid our kitchen a few years ago and used Diamond cabinets - not high-end but they have held up very well in a heavily trafficked space. Is there a bathroom vanity equivalent? Should I ditch Fergusons and go to an actual kitchen/bath cabinet shop?

@Laney Adding a towel bar doesn’t make a wall look longer - it’ll just restrict the size of art you can hang on wall. What color? Many / any!! You have a blank slate there with flooring & wall colors. I would hang art on the wall you face on entering the room. This way it’ll be seen when door is open. What’s your favorite color? What’s your theme in the rooms outside this powder room? If your art will have a frame, think silver like the fixtures - what does the mirror you’ll have over sink look like? Cruise through large canvas art sections at stores like Home Goods, Marshall’s etc. You’ll find lots to choose from at reasonable prices.