The only improvement I can see for a master grade exia is the proportions & maybe an attempt at the sparkle boarder-line wings of light effect.
Anyhow heres a couple of new pictures of my destiny master grade:
http://farm3.static.flickr.com/2011/...6954eb72_b.jpg
http://farm3.static.flickr.com/2224/...4a5f7d63_b.jpg