I'm not going to lie - I think this would've deserved to be in the top three. I love the scale, the pose, and the detail. Only thing I might have to say I don't like is the extreme bloom effect at 'her' head. It makes it difficult to make sense of it if you didn't look at the concept art (or maybe that's just me. ._.).
EHHHH, why didn't you win?! The other ones were beautiful, but, to be honest, kind of overdone... Yours features a unique perspective, up close and personal instead of a master shot, and it's more godlike than creature-like. Maybe they liked the creature-looking ones more? Anyway, this is gorgeous I'm glad I discovered you.