Love the Mondrian inspired design. The flat colours and the framework work so well with the theme of comics and the team aspect of the series. You have an amazing sense and talent for design styles and what you can adopt for your covers, truly!
Are you kidding me, "not that strong"? Besides, having it come easy is not the point or a criterium. It's the result AND the process that count and the more laborious and tough on the artist the process, the better. Think Picasso, that dude isn't the most famous painter because he was enjoying the joie de vivre and creating amazing art in his sleep.
Well so what, if you make use of dramatic lights, one could say 'caravaggio did that already'. Every artist uses a language, or mixes several languages like you did here. That's where creativity goes. You basically reinvented a language and codified it into a new context. What more can one do? It's not just an awesome technique, like it happens for most comics covers. It also shows a deeper level, and I find that admirable.