Overall good work! The main point being to get you comfortable with the different digital tools and to know the different options exist so you can play around with them later as you work through the terms.
Mei was probably the hardest when I first tackled this, at the time my understanding of saturation, hue and luminosity was fairly limited. Now it's clear she is a bit more saturated and there's a bit of hue change (redish..?). It's interesting to see how these are tackled by new people.