I'm going to focus on Harry, because the earlier reviewers have hit upon the awesome of Ginny's hands and Severus.
The way Harry's hand is outstretched- it's. Ot as if it is reaching out for Ginny or the past, but as if he is gently letting it go. At first I thought He was looking down, but now it seems as if he is closing his eyes in preperation for a kiss on the forehead from Severus. Ther is a sense of benediction in his pose that seems to portray acceptance in such a lovely way.
Also: artists are magic. It's true. I'll never get over the blues and greens in this picture.