In addition to the slip issue, I think you want smaller tiles to make it easier to work with the slope you need for the drain. More on reddit.com

I know this is an old post, so I’m posting for others searching this subject. In this example, 12x24 tile is trendy. Look back in historical photos - do you ever see such a large tile in a home? Very likely not. Hexagon tile is more classic, depending on the color and material. As someone pointed out, Saltillo is timeless. But, it’s really only timeless in a home whose architecture style has historically used it. You can make any shape trendy, depending on size, material, and color. If you have a Spanish or Mediterranean home style, Saltillo hexagon is a perfect choice, no matter the year. Saltillo in 12x24 would look out of place in everything except perhaps a modern Spanish home(?). Make your tile choices simple. Use neutrals that work with your other hard finishes. Don’t opt for an extravagant or busy pattern. Add color and interest in your less permanent choices, like rugs, art, and soft furnishings. If you do those things, you can redecorate without the urge to rip out old tile. More on reddit.com

From the photo it looks great! Grout lines look consistent. Tile looks to be a little too tight to the wall, which may have caused the lippage, can’t say for sure. Usually you can rely on trim/baseboard to cover your expansion joints. But nothing really stands out from from what is pictured here. Would have attempted to shim the subfloor to level and used 1/4” cement board over subfloor to avoid the weird swelling/uneven surface with Ditra membrane. Overall prettay nice floor job for a first go! More on reddit.com

100% always the case with 8” hex. Don’t use spacers. You’ll need grout joints just large enough to “fake” a straight layout. Don’t go too tight. More on reddit.com