More pictures of the glass tiles

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I am sorry i don't know how to post all pictures in the same post. Have to do it one by one.

one more

No, that's not acceptable. There are proper methods to make the tile flush, which your tile setter does not seem to be aware of. The grout also does not look good. I hope you haven't paid for this yet.

The grouting job is not acceptable to me, nor is the crookedness of the grout spacing and the surface elevations/depressions. The tile is so pretty. I think the tiler is not a good craftsman.

Yes, the lines are all crooked. Just spoke to contractor. He agreed with me 100% and will take out all the glass accent tiles. But the reality is, the glass tiles are substantially thinner then the big porcelain (beige color) tiles around them. So in order to bring the glass tiles out, they have to apply an excessive amount of thinset, which makes it difficult to have a flat surface. At least that's how he explained to me. He is going to take out all the glass tiles (except in the shampoo niche) and redo. But this time he will put a thin board of hardibacker behind the glass tiles first (to better reduce the difference in thickness), then apply thinset and put the glass tiles back. Do you all think it will work?

DH either built-up or recessed a portion of the tub surround wall for the split-faced mosaic border in our hall bathroom. Our tile guy is very exacting, so he then used more or less thinset as needed in order to make sure all was straight and level (tough to do with the varying thicknesses of the split face tile, but he and his helper are true artisans, and even more detail-oriented than I am, if that's even possible!).

The problem with applying a thick bed of thinset is that when thinset cures, it shrinks. So if your setter uses a thick bed of thinset, as the thinset cures and shrinks, it can pull the tiles out of alignment. That's why you don't use a "thick" bed of something with "thin" in its name.

The wackiness of your wall looks part intentional, part unintentional.

For your situation, I'll do what your contractor is now proposing. I'll pad out behind the thinner tile with an additional layer of "something".

Years ago I used to apply a thickness of thinset where the thinner tile would go. Let it cure. Then tile over that thicker starting bed as usual.

Now I'll use a strip of Ditra for thin pad outs. I've never had a case where I had such a substantial difference that it warranted putting in a layer of hardiboard or another tile backer board.

The tile backer boards are 1/4" or 1/2" thick plus the thickness of the thinset to adhere them in place. Ditra is about 1/8" to 3/16th" thick.

That sucks, as stated above the addition of another layer of backer (which should be adhered to the first layer with thinset) is the correct way to deal with uneven wall tiles. This can also be accomplished using only thinset, although it requires grounding (installing a temporary border) around the accent area, and using thinset to float the space out evenly (then letting it cure) to allow for the different sizes of material to finish in the same plane.