As the others have said, it looks great! Likeness is fantastic, and you really nailed every aspect of it. The only thing besides the jacket color that might need an extra look is the lightsaber... Isn't it a bit too small? I could be wrong, but I always thought the handles were pretty chunky.
Update: Darkened jacket and skin, scaled lightsaber, adjusted hairline, played with spec and gloss values, adjusted lighting a tad, and filled out his face to better reflect how Boyega looked in the film. Final action pose coming after New Years. My artstation https://www.artstation.com/artist/andyfoster