Hello Sandi:
The one you have is about as big as they get. For a small skink species I find that they truly are one of the most hardy. They pose few problems and settle in quickly.
The one you have really is one of the prettiest Ocellated Skinks I have seen. A very lucky find indeed. If you get a chance to pair it up they do breed in the terrarium. Females tend to have thicker bodies than males though that may not always be true. I have looked through hundreds of them and found that seems to be the case. They usually don't fight (or not that I've seen) so keeping them together is not a problem. Besides, they can easily get away from each other by burrowing in the sand.
I'm glad the info was of some use to you.
Have a Great day!!!