These are not your textures!!! You stole it from an app. The app is called Pixel Studio and it's available for free on mobile and PC!
Viewing post in 16x16 DungeonTileset II comments
Come on my friend, 16x16-dungeon-tileset was published in May 2017, it's probably older than Pixel Studio you're talking about (not sure which one it is though, I found 3 pieces of software with the same name -- glad to see I'm not the only one struggling with naming things :D).
In any case, I'm happy thee are using the characters :)
(It might be the NFT one I believe :/ so I guess less happy)
<3