Wow, this is beautiful!! It's amazing what you managed to achieve with just those two colours, especially the skin tones on his face... The colour choice is very fitting, too. Was that intended or not?
Yes it was! Blue and red are my go-to colours; I usually end up using them the most for their symbolism in Les Miserables. Red connotes passion, anger, his convict status, and the fact that his young-at-heart. Blue represents aloofness, cold, mystery, stability, structure, and loyalty.