I really like the darkness and the overall feel that Staryu is just floating on the waves.
I love the details in the waves and the sky. They look very realistic, and the stars are perfectly noticeable, yet fade nicely into the background. The lines are very leading, focusing on Staryu in the centre. I would have to say that you could have gone with the image being a bit shorter, not so much empty space in the bottom. The outline of Staryu also adds to the look that it is in the water, and are done so very well. There is a very good attention to detail.
The waves have amazing shading. The darkness is a little overdone, but it adds to the overall feel to it. The lighting from the gem in Staryu is very well done and gives a great source of light in the image, even giving some of the colours a red tinge. The shading on the waves is impeccable, the shading makes the waves look real and very professional.
Staryu's colours and shape are pretty accurate. The only problem I have is that you have 5 ridges on the yellow part of Staryu where there should be 6. Other than that there is nothing to complain about.
In the end I'd give you a 70/60 so you pass!!!!!