The art is beautiful! As for Raeki and Ajeel's duality I would personally like to see Diligence & Sloth. I feel like lots of people can relate Ajeel and it could be great to see them learn from each other. But Humilty & Pride could be great too because they are very relatable as well. I can see why you are having a hard time making a choice :D. I would go with what virtues you have most experience with. I look forward to seeing it!