Eye color or little costume details aren't fair indicators sometimes when a lot of artists tend to ditch something or other because of choice or just plain getting it wrong. Occasionally, you need to go with your gut.
Since her eyes here could be mistaken for green, blue, or something between, and due to the similarity of the costume, I'm guessing it's Alter cosplay, or literally changing into Alter.
uberlegen said: pixiv says it's an original
Yeah, and it's also grouped with other pictures, some of which are clearly from something, along with additional Manga and Copyright tags.
UnderneathTheWaves said: The Twitpic version says it's Saber. ...
Does the Twitpic say Saber or Saber Alter¿ If it's not an original image, and the Twitpic merely says "Saber" then that's normal Saber to me. Artist be damned.