My dark side is insensitive, callous, and cruel, but somehow we always end up seeing eye to eye. We've been on some crazy adventures together.
I'd say we've grown close over the years.
It's always fun to see different sides of us personified in art, and the design you chose to show yours is original and interesting. It leaves me wondering why your dark side is represented as a tongue, and making the viewer think is a strong power to have. (Don't explain the choice to me; it'll ruin the wonder!)
I docked some points because, right off the bat, the piece looks unfinished. You've still got a million vestigial sketchy lines everywhere, the colors look flat despite some minor effort to show form, and you have no defined light source, despite that red moon looking like its more than willing to fill that role. The randomly-placed highlights on the creature bug me as well. This looks closer to a thumbnail or concept sketch than a finished work of art.
I'd love to see you revisit this some time and turn it into something truly impressive. Let me know if you do!