OMG Spectacular!!! you got such great use of the contrast and the dynamic composition! Reminds me a little also of Yuko Shimizu's style.

Also with regards to the human condition, try Steven Pinker's books on evolutionary psychology. I find them very compelling in trying to answer "where emotions like love, competitiveness, compassion, etc come from?"

On the other hand, keep reading whatever makes you produce work like this! :)