These are quite excellent!
I love the style and the use of photoshop is far superior than anything I've ever been able to muster. XD
A bit of critique, though, if you don't mind. :3
I know I might just be pointing out some things you've already caught yourself, but here's a few things I've noticed. I love the purple in the shading, however it seems odd that you only did it in the hair (save for Purimu, and even then it isn't throughout). The use of purple in the shading does take away the darkest darks in the hair, which is fine. It gives it a soft, almost "candy"-like feel which fits the style quite marvelously. However, in the clothing and skin tone, there is no purple and so the shadows don't have the bright purple to detract from the illusion of their depth. This makes the head and the body look strangely detached.
This isn't so much the case with the girl, but there's something else I've found about her that I feel I should address. You also use different shading styles in Purimu's pants than her top. That inconsistency makes the character as a whole look a little odd. In the pants you use an almost cell style shading technique, but in her torso you use a gradient. I see the darker pink you used on the outside of the purple, but it's not enough of a gradient to fit the use of purple in the hair or the shading in general.
That was a bit lengthy, but don't misunderstand: I love these a lot. The obvious skill in how you rendered everything is incredible. I hope to see more art from you.
