Ooh, "mystery" artist, this is so gorgeous and fun! Why hasn't this fic been written?!!!
I love the coloring and especially the composition - it's like the curtain opening on the play. Snape's expression seems to be a combination of bitterness and shy hope, absolutely perfect for the theme, while Harry looks every bit the indulged, arrogant young son of James that canon Snape mistook him for!
While Ron looks every bit the follower - yet also open to the possibilities. His eyes seem to calmly take in the street seller of potions, even as he stands behind Harry, while Harry condescendingly lectures the poor blighter. Ron's telling of this story might be the most interesting. I can already hear the voice of his fiancee, the honorable Miss Granger, calling his attention to how it's social injustice that has forced Snape into selling himself his potions on the street, not the personal flaws that Harry blames...