The indoors swimming pool was decorated in the Greco-Roman style, with elaborate tile mosaics.
The art-deco type statue features Diana and a fawn. The colors feature cobalt blue and gold leaf.
It's certainly the most beautiful swimming pool I've ever seen!

"The Roman Pool at Hearst castle is a tiled indoor pool decorated with eight statues of Roman gods, goddesses and heroes. The pool appears to be styled after an ancient Roman bath such as the Baths of Caracalla in Rome c. 211-17 CE. The mosaic tiled patterns were inspired by mosaics found in the 5th Century Mausoleum of Galla Placidia in Ravenna, Italy. They are also representative of traditional marine monster themes that can be found in ancient Roman baths. The statues are rough copies of ancient Greek and Roman statues. One such copy represents the "Apoxyomenos." Statuary was used on a considerable scale in the Baths of Caracalla."
http://www.hearstcastle.com/history/pools.asp