I do think the Vivi design is interesting, but it wouldn't have worked with the personality he ended up with in the game. Not enough awkwardness/uncertainty in his look. Overall, I'm glad they went with Amano's designs (tweaked further by Square). However, it would have been cool for Garland to have a second form, and turn out looking like the one this guy did, kind of to punch home the relation to FFI further.