Glad you liked the thumbnails. Overall technically I would say try to research about atmospheric perspective, and local values. This is a pretty good tutorial for it. -->
The other three parts of those tutorials are really good too, if they look like they're a level you can learn from.
For books, I would recommend "Framed Ink" by Marcos Mateu. It's for storyboarding rather than landscapes, but pretty much all the lessons transfer over. It teaches overall how to capture story and make an interesting frame. It has good explanations, but the art in the book is really where it's at.
For characters in perspective, I would recommend Proko's stuff:
Cubebrush Store
Youtube
His Store
On Youtube you'll have to go back to his older videos to find ones on gesture, the robo bean, land marks, and mannequinization, or it will be the figure drawing course on his site. From there, you can start just constantly thinking of the body as an object in 3D space, and you'll get much better with time and practice.
Conceptually these aren't too complicated if you take it step by step. I just liked the idea of a giant as a starting point. From there I thought that having it in a valley or cavern would make it more "insurmountable" for the challenge. And the army is just there to add conflict/interest. Concepting isn't too hard once you have your pieces and aren't working with a blank document any more.
Hope this helps you out, and good luck!
