I need to see the tile and the window .

How do you want this window & tile to meet??? Take a look online at your options. Make sure any necessary trim tile pieces or metal trim is purchased to achieve your desired outcome and discuss this in detail with the installer.

This window below has small mosaic tile mounted on the curve to waterproof the surface.

Tile trim like you see below is carefully cut into wedges to fit around the window.

There is flexible metal trim that provides a clean edge for cust tiles.

We need to see your actual window.

i came up with this

Here is the window. The bottom square window is going to be covered up and tiled over. if i am doing vertical stacked tiling i do not know how they are going to do it with the curve.

Ripping out tub and shower and making one large two person shower.

one shower system where current is and adding one on opposing wall.

This is how i want to stack the cloe tile

Waht is the window made of? I think it would be better to hjust eliminate the widow or put a nice horizontal one high up and not curved.If the top stays then you speak to your tile setter and make sure this is not some random contractor but someone who actually knows what they are dooing

Thank you Patricia. we thought about doing a linear window up high since this is the only window in the room but they cannot match the sandstone that is the outside of the house.

It can be done.

Get a good reputable tiler.