Wow…what a unique art style! I like the vibrant splotches of colours that bleed through the drawing lines, and the blue pen on top of everything really emphasizes the details of his face and head. Your style also reminds me of the self-portraits made by Bryan Lewis Saunders, a man who drew portraits of himself while on loads of varying drugs (which is a good thing).
Overall, an amazing sketch that deserves more recognition. Keep up the good work, man!