I screwed up on this big time, especially when I unintentionally made the crack shift... But anyways, the "window" basically symbolizes the thin inbetween of traditional and digital art. I chose a window for this because you can see what's on the other side while still being on the opposite side. I really like this part about art because I love seeing hints of traditional art in digital art, and vice versa (like the digital brushes that make marks that look like paint brush or pen strokes)
Also, sorry for the long explanation... Hope you enjoyed.