It's a very good drawing all n' all, BUT Deli's arms are a bit long for her body and posture. Rio well his torso is a bit to long for his legs or it's his neck, but somethings to long, the colours blend perfectly and that's really great lighting, the eye's look really nice and the shading is just a bit off. (not really though)
Your drawing's are amazing you just need practice and you can get much much better.
Your really good at drawing and shading! keep practicing! and i'll keep trying to find a better quality of lighting we'll go on together!