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I'm not entirely sure if its been done before, but i made this autotile cos its just quicker than using the tile set, an you can get more natural shapes. Since its my first ever autotile created, or made rather, i wanted to get opinions...
It has no mistakes, however it is *exactly* like using the tile set, pixel by pixel.
If that's what you wanted, excellent.
You could have made it better, by making it rounder/ or adding a texture to the middle tile, so it doesn't look so flat.
You should edit in some texture or at least make it more natural. You basically copied the work, copied bits and pasted it for the top left and top right corner then moved it to autotiles.