Certain TE ponies are known to have more of a clearish/grey tint to their eyes. Often these are the "non pat. pending" versions of these ponies. It's possible that could be the case (though I haven't seen the photo of Fizzy to know for sure).
Here's a pict of my grey eyed Sweet Stuff versus my regular Sweet Stuff.
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loginLet me pull up a link about eye oddities in TE's...give me a minute.