You are a great artist. The amount of detail and color you put into this picture is amazing (I can't find the reference picture through the link however). You gave each of the characters defining characteristics (different shaped eyes, heads, and clothes). When I draw, everything looks uniform and dull so I aspire to draw more like this.
When I write reviews, I usually make a suggestion for the picture or art style, but there really are no pointers I can think of (except for maybe the nose on your character. Perhaps its just me, but it looks weird when I look directly at it).
Great job. I'm sure your friends loved it! (and as I said in another review, you still look pretty).