I think the horizon line should be lower in order for it to make a little more visual sense, but I still love this piece. His longing expression and her obliviousness is so cute!
I hope what I write makes sense: The stairs seem to have an angle, I mean going up/down not straight ahead. Because the viewer has the same angle as the stairs, that messes with perspective. My opinion is, the viewer should have a different angle, like watching from higher or lower.
WOW! Gorgeous! I love the whole idea, and it's really well executed. I think the fact that the girl seems to be facing us with her left shoulder closer throws me off a little since it seems like the right shoulder would be closer to me... But that's nitpicking. Wanted to say something constructive lol.
"Dear girl on the escalator... you were going down, I was going up; how can fate be so cruel?"
I really like the lighting.