"I've said it so many times. I would change my ways, no, nevermind. God knows I've tried!" ~lyrics from "Call Me" by Shinedown. I was listening to that song while looking at this picture, and I think the words really work with it.
I feel like I'm spying on a personal moment, looking at this picture . . . they both look angry and determined, Harry to get what he wants, and Snape to resist. And they're both crying (aren't they?) so whatever they're fighting about, they both want it, and Snape doesn't look like he can really deny it. This picture is amazing (whether I understand the artist's intent or not - I think that good art can always be interpreted in more than one way) because it feels like it tells a story - I think this one's definitely worth a thousand words.
Just an awesome piece. I love the bitter anger in both of them, and the pose here is fantastic -- Snape straight and unbending, Harry in contrast with tension and movement. The rain adds such grittiness to the scene and a physical manifestation of their turbulent emotions. It almost covers up their tears at first glance, but then adds yet another dimension to the despair here. One of my fav Snarry fanart.