As an artist, I can tell that Assasinmonkey did it on purpose to make it interpretative, mostly in a sad way:



We are not watching their faces, and their body movements give us a lot of information that could be anything from sad to nostalgic, from happiness to worried, from worries to relief, so we can only imagine if they are smiling, or crying, or any other expressions (first point);



The background is blurred with different colors, and even though we can tell it's part of Twilight's castle (judging by the crystal colors in the walls), we can still assimilate with other objects, things, *memories*, and each person that sees this picture can find a different thing with it (second point);



We can see there are some books over there, but nothing more than that, to make sure we have one thing that is really important and part of their lives, however, the characters and the picture itself don't tell us the rest of the story and what's going on, making it up for us to decide (third point);



You could say it's raining, or that there is sand falling down in their heads, or that this picture looks like it comes from an old paper, to remind a moment in the past (fourth point).



Overall, the desaturation, and the occult, and the "old" aspect of it, how the composition aim for the characters and their surroundings, everything makes it a sad, mysterious picture.



I would have a lot of trouble to decode all those interests in a picture and make them work so well together, so I can't tell you guys how amazing this art is.

Bravo Assasinmonkey!