Not to beleaguer the point or clog the thread myself, I made some quick and rough color modifications there.I did.
Miku's hair is much closer to green than it is to blue, so while it is a cyan color, your pick was way too saturated and way too blue. I also have no idea where that yellow color was coming from, but the primary trio made her look less "Miku" and more "party clown." Like GayestTrap said, the fewer unique colors you use, the better. Since Miku's original outfit was gray and black, with mostly cyan and tiny red accents, I figured that'd be the best scheme to go with. It's more recognizable as Miku beyond just the cyan pigtails.
The red accents were distributed nicely, though, so props for that. They aren't obtrusive and they complement the design rather than sit on top of it.
Something you're also gonna wanna do for future reference is check what your drawing looks like in black and white while you're coloring it, and make sure your values aren't too same-y. I'd also suggest staying away from the massive areas of solid black, 'cause they draw the eye to a stop and it eats up the lineart. Try a very nearly black color in the same hue/color family as another main color on your piece, like a dark magenta or cyan here, just light enough so the lineart's still visible but dark enough that people will read it as black on a first pass.
All in all, great job emulating Destiny's art style, and nice middle ground between the "latin-american grandma" and original Miku designs, but man, the ball was dropped hard with the colors. Solid B+ though.