First of all, that may be the first Zygarde-EX image card I've seen. Possibly due to a lack of decent Zygarde images, but at any rate, you pulled it off fantastically. It's easy to see how much you've improved since the early cards in the OP.
Next, a bit of critique.
–Regular art EXes usually have the special effect (in this case, the lightning) going around the border, not just around the image.
–Speaking of which, I caution you from overusing the lightning. It's a very good effect, but it probably shouldn't be on every regular-art EX card.
–Same for the background on the FAs. It's a good background, but you seem to be overusing it a bit (or maybe it's just the texture).
I also need to know where you get the lightning.
Next, a bit of critique.
–Regular art EXes usually have the special effect (in this case, the lightning) going around the border, not just around the image.
–Speaking of which, I caution you from overusing the lightning. It's a very good effect, but it probably shouldn't be on every regular-art EX card.
–Same for the background on the FAs. It's a good background, but you seem to be overusing it a bit (or maybe it's just the texture).
I also need to know where you get the lightning.