These great art pieces of Batgirl and Power Girl were created by Stanley Lau as concept art for Sideshow Collectibles. Lau's art style translates well to sculpture because his subjects always feel fully dimensionalized, and his posing is also more natural than the extreme posing of other artists.
There are a few photos out there of the finished statues, but I didn't like the quality of the images so I did not include any. The official photos always look better anyway. Via: xombiedirge.