The Titan: this is one of the concepts of the great Brian Coughlan https://www.artstation.com/artist/bri-in-the-sky that I had the opportunity to sculpt for Endure the Stars of Grimlord Games.
Endure the Stars is an epic 1-5 player Sci-Fi co-op fight for survival. https://www.facebook.com/grimlordgames
Here few Keyshot renders with some adjustments in Photoshop of the Zbrush sculpts.
Check out the Kickstarter campaign and support it if you can! :) Hope you'll like the entire project!