Advice on contractor mistake

[Kellen Canfield]

I’m seeking advice on what to do about a mistake that my contractor made on a remodel that I’m managing from afar. I explained that I wanted subway tile backsplash in the kitchen. The contractor sends me pictures of the tile to confirm I like it and I gave him the go ahead to put it in. I didn’t think it would be necessary to explain that I wanted it to go in horizontal as that is the common subway tile look. He ends up installing it very well, but vertically. It doesn’t look terrible, but is not the look I was going for. Am I to blame here for not communicating well enough? Should I have him fix the mistake and redo it horizontally on his dime? Any advice is much appreciated.