Can you take a picture of the wall your vanity is on?

I think I'd do a tile wainscot around the entire bathroom with a pencil liner at the top. That way, the transition between the shower and the wall will be seamless. I would do subway tile, then use your mosaic tile as accents in the shower niche. Or in a continuous stripe, per the photo below:

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Wainscot is a great idea! My current bathroom has the tile shower come off and does a half wall where the sink is on both sides of the sink and the back of the sink but that's definitely more 60s and 70s style (which my house was built in 1972) The wainscot will help the weird space but also look updated.

Like the wainscot, but another option would be to extend the splashback to the shower and then down to the floor. To my mind, this would give a better visual stop to the

I never thought of wainscott. Now I'm going to be looking at a ton of pictures lol. So something like this picture? Subway tile in the shower instead of the 12x24 and then the wainscott acts as the backsplash too? Mike I also thought of that. What about having an accent strip in the shower so it blends into the mosaic backsplash?

People are telling you to do this

https://www.houzz.com/photos/guest-bathroom-traditional-bathroom-san-francisco-phvw-vp~61415959

But I want to ask what your overall aesthetic is for your house? If your house is transitional or traditional then the wainscot look is fine. But if the rest of your house is leaning more modern or contemporary then I say just tile that whole wall in one tile - larger format. Get your tile spacing figured out with what you are doing for a mirror and lighting.

Here they economized and stopped the tile -

https://www.houzz.com/photos/fairfax-bathroom-w-neo-angle-shower-contemporary-bathroom-dc-metro-phvw-vp~159178646

Lastly, here it’s a large format on both walls.

https://www.houzz.com/hznb/photos/bathroom-with-neo-angle-shower-craftsman-bathroom-baltimore-phvw-vp~38494848

The most important thing with a small neo angle shower is to make sure you have your glass co figured out and that they can give you a water right shower. The angle on the panels is tricky to get right.

Water tight

Thinkdesignlive my house is definitely more modern. I have actually thought about tiling the walls with the large formats. It is a fairly small 6x7 bathroom. We previously had a neo angle we pulled out, definitely don't want any leaks! Thank you

Depending on the size of your shower you could explore a pony wall by the vanity. This would gain you 6 more inches of counter space and storage. You could do a niche in the pony wall to keep the 2 main tiled walls visually clean.

But I see a vanity and top in your photo - is that to remain as is? If so, I'd explore a tile that has a bit less pattern to it (like the one in the last shot I posted) - and you may want to look at something more warm vs the tile I see on the right which is more cool. If you are doing a whole new counter then ignore these comments.

Thinkdesignlive the vanity top will most likely be returned. I ordered it online and it was nothing like the picture or description where I ordered from when it arrived. It has almost a pink/purple hue to it which I agree doesn't look right with the tile.

I was going to try to make that top work but it is throwing literally every thing else off. Thinking about going with just a solid white.

@ksinmt79, yes that photo you found is a better representation of what I had in mind. I think that will look way more pulled together.

I would suggest looking into larger tiles than mosaic. There is also this metal edge stuff called shulter, or some word like that. Look at Floor and Decor. Also do not do a niche. I have seen where they do a ledge instead. Look in Houzz photos. Niches are pretty but they look really ugly when they get filled up with shampoo bottles. I wish I would have done ledges in my 2 new baths. One of my design regrets

The metal edging is called Schluter and it’s only needed if you have an exposed tile end - if going wall you wall you won’t need it. I think with a Neo angle shower you can’t really do a ledge but I’d have to see the plan to comment. I actually really like the Kohler large corner shower baskets for corner showers.

Here’s a shot of the corner baskets.

https://www.houzz.com/photos/madison-bathroom-transitional-bathroom-new-york-phvw-vp~27679238

A better shot of the corner baskets

https://www.houzz.com/photos/bathroom-traditional-bathroom-new-york-phvw-vp~66458

I hear you have the option of returning the counter? Before you do that why not post a better shot of it and the tile you are looking at. You might want to lighten up the wall tile if you are thinking of going wall to wall on the 2 major walls.

Thinkdesign I will get a better pic of the wall tile with the countertop after work. It actually is pretty light, the pic I posted makes it look darker than it is. This is it though, and it does have some warmer light beige undertones. I really like this tile (took me forever to find one and we have limited options where I live) so would rather design around it vs changing it. Ran the idea of tiling the walls by my husband and he does not like it lol. Either way, the paint color is getting changed.

Then you will definitely want to use the Schluter edge on each side like Rachan mentioned...You might be able to pick up a solid white quartz remnant for the counter top. If you have textured wall tiles and textured floor maybe keep it simple for the counter top. You could do a high backsplash in the same material and that would eliminate the need for a tiled backsplash.