Not too bad at all for a beginner! The temple itself looks very nice; the island could benefit from rounder edges, and maybe you might consider making the island a BIT bigger (adding a hill and placing the temple on top of that hill. Otherwise, Mr. High Tide might damage the marble! :-) )

About the only other comments I have concern lighting and texturing. You'll improve exponentially in both these endeavors with time! For now, try turning on shadows (the on/off switch is in the channel box and attribute editors for the lights) and turn down the intensity of the light inside the temple!

Keep at it, it's coming along just fine!