Terra concept worlds thumbnails

As I continue to study more and more concept artists, I came across Wootha's crazy cool work. www.artstation.com/artist/woot… 
Saw some of his process videos and got inspired to try doing some concept thumbnails of my own. These still have more work to be done if they're to become anything, but I'm having a ton of fun trying this out. 

Hope you guys like them. 

God bless!

-Joey