The little Miku is to die for, OMG.
These are great, awesome use of color with a variety of poses. The Dryad is breaking my heart, I wish she felt like the girls to the right of her, but the contrast is effective for art. They should just hug the Dryad.
Revisited: I've realized that this is basically a showcase of your greatest strengths! Expression, gesture, shading and coloring! I was so distracted by Miku and the Dryad originally that I didn't appreciate how cohesive these images are as a package, showing off what you can do!