Hello, Iv recently accepted a job position of graphics artist in a game currently in development , thing is there was already half of a tileset finished so instead of recreating the whole thing , the owner of the game asked if I could add on it , which means I had to adapt to the style path already drawn, Iv started with the cobble stone , this is the 3rd time I stay up till 11am trying to fit this together, here is the style iam going for

  ( this is the tile that already exists)

here are my numerous cobblestone tile that failed to fit that syle x.x



I know what Iam doing is wrong by just keep trying to make the tile and hope it just matches the style instead of actually studying it and understanding how light works better , I am just trying to create a cobblestone tile that fits both grass and the rocky mountain tile, any help would be greatly appreciated thanks for your time. , (ps:if any one has the time to actually tutor me how I could grasp the way light works and how to actually adapt to some one elses style that would be amazing <3)