Hi, this is pretty good! Just some critiques I have, more specifically on your drawing of Rin, is that you should try to shade with a not so umm, gross yellow. I'd recommend using just a slightly more saturated yellow or even a bit of an orangey-yellow. Keep up the good work! ^u^

Also ahh when you shade you should avoid using black and lowering the opacity, I personally custom pick all the shade colors for my art, but if you use even just a basic color like blue or purple or red it'll make it look much better sorry I forgot to add this. XD