I like Severus. Eyes in the shadows, mouth set into a line, probably sad and apprehensive at the same time, but outwardly looking dangerous. (And even though I don't see Hermione, I like her being there too, and I can imagine her, the way you described it. :-)) + (to keep going with the story of people outside the picture, I imagine Snape and Ron will run into each other any moment now ^_^)