What I love the most about this picture is all the details that you put in. Not overdoing it, but all the smallest details that contributes to a final product that is touching and meaningful. The stark contrast between the cave and outside is amazing and conveys a great message of the gorgeous outside world, while hidden inside, the two characters are suffering.
I'm not familiar with the characters, but I think the overall theme is quite original and you managed to pull it off perfectly as well!
The technique you used in this picture is amazing and one can truly tell that you spent a lot of time and heart in this. From the well shaded characters, to their expressions, to the dreamy scenery outside the cave, everything is perfect. Again, what I love most about this picture is the difference between the scenery and the characters, yet the whole image still has a uniformed look.
Like mentioned in originality and vision, I love the way that it appears as if the cave is hiding away the pain, suffering and anguish while outside the cave, everything appears dreamy and happy. This picture makes me want to know more and learn about these character's backgrounds!
All in all, this is a gorgeous drawing and I can't wait to see more from you!!