I love this rendering of a younger Snape. Particularly the highlights in the hair, and the 'intelligent', focused look in the eyes. The pallor in the skin tones, as well as the somewhat compressed lips are nice touches too. Great job...
Quite a great picture. It's a nice portrait of a quite younger Severus, I like it: you were able to keep his main lines - his noses, his eyebrows, his lips - as they're described in the books and to have them younger and softer. Beautiful shadwing, I like the feeling of black and white given by his main colours.