Critiquing for Assignment 3

The shapes I designed come from the symbol of a traditional chinese religion group Taoism, and the symbol is called 阴阳鱼(Yin Yang Fish). The idea of Yin Yang Fish came out from my mind immediately after the instructor told us the requirements of assignment 3. The whole image is aparted by a curve line, and each side of the line has a circle. The color of the two sides are opposite, and the two circles' colors are also opposite to each other, and plus, the color of the circle is opposite to the background of its side too. The whole image presents Balance by using two very different colors, black and white. You can't tell which color is positive space which color is negative space. The focal point should be the centre of the image, because of the Balance made by the two colors. Also, the visual weight should be balanced. The image may not be so perfect balanced, that because of my unskilled manipulation of Adobe CS5.