I absolutely love your drawing. The design is so bold, the lines so clean, the movement so dynamic! This would make an excellent T-shirt design, or the cover for a sci-fi novel, or the mission badge for the first-ever team going to Mars. I hope you are considering a career as a graphic designer when you grow up.
As to your question, which of my books do I like the best, I would have to say it is the one I am working on right now, which isn’t even published. I’m still working on the last two chapters, and it is only the first draft, but I’m having a blast writing it.