Balance

Reflection Symmetry- Both halves are perfect, and if folded in half, would line up perfectly.

Ruiz, Alex. The portal of destiny. 2012. DeviantArt. Web. 16 Nov. 2012.
<http://alexruizart.deviantart.com/gallery/?offset=24#/d4pzlv1>

As you can see above, the face shows perfect symmetry, if folded in half, it would line up perfectly.

Asymmetrical Balance- Both sides are completely different and they do not match up no matter what.

Powell, Rob. Asymmetrical Tree Crab. 2012. DeviantArt. Web. 16 Nov. 2012.
 <http://rpowell77.deviantart.com/gallery/#/d4p29cb>

In the image above, the poor crap creature's body is highly disfigured and has no symmetry what-so-ever. It cannot be folded in half for a perfect fit.

Radial Balance- All elements radiate or circle out from a specific point.

The portal of destiny. 2008. DeviantArt. Web. 16 Nov. 2012.
 <http://autumnsgoddess.deviantart.com/gallery/?offset=216#/d1ntnmp>

In the image above, all the elements circle around the center of the image to even going as far as the actual doorway as a circle.