I loved your MASTERPIECE.
I hope you'll add "Sand Dunes" and "Volcanic Mountains" as well.
And if you'll allow me to give you a few ideas; it would be GREAT if you developed it further, terrifying dark forests and ruined structures or pyramids or gigantic statues would also be great ideas.
More fantastical elements like mushroom forests and underwater civilizations (Atlantis style) for fairy civilizations would also be incredibly good.
All in all, I hope you continue to create, I loved your drawing style. I looked for more artwork on your profile hoping to find some, but unfortunately I couldn't. I would also love to get character sprites if I could find any made by you.