Rainbow Dash - The Zap

Rainbow Dash as The Zap(reference to the flash from DC Comics? don't know) from S4E6. It took me long enough to make this, especially since I started drawing this sketch right after the stream from Otaku Ascended. The image in my head was fading away, and every picture I found of here were kinda low resolution... meeeeh Q_Q so I don't know if I got the necklace thingy right :S

I also tried to apply the advanced shading instead of good old MLP shading(shadow on the bottom and the back legs just darker).
It looks good but I somehow feel it is not right. If someone sees the mistake that I have done, tell me right away o.o I just can't seem to find it, but to me it looks like something is off, but I just can't tell what.

anyway with best regards Neriani <3