Grassland for your creations. Give me a credit if you use it :3
Once again, I'm rejecting your graphics for the very same reason: lack of proper shading.
The grass and dirt looks flat because there's no extra colors. I suggest you check some pixel art tutorials, like Lumy's Workshop . While it doesn't cover everything, it shall give you a small base to start with. Do not be afraid to ask for help in #graphics or #help in our Discord server.