Valencia's hair isn't green, its CLEARLY blonde. + I don't like nor watch/listen to anything vocaliod (however you spell it), so if the outfit is similar its a mer coincidence. + Looking having seen this miku character drawn and drawn again, I can definitely say there's no similarity in the face. Two different art styles hun. = Not miku.
If anything I'd say there's a closer resemblance to sailor moon or Zelda (because of her elf ears) because of the long blonde hair
Vocaloid is done by MANY MANY artists, so the style can be from Chibi to this. I like your style alot, and I listen to a lot of vocaloid songs that have Miku depicted as such, so to be she looks like her.