I agree with the above. The system parts do look a little wonky. I've looked at the others and I know what you were trying to do, make bendable waists, which only really look good with system. Unfortunately, I haven't found a simple multi use bendable waist that looks good for anything but an industrial robot yet. What you could have done is use the cross hole in the ball joint brick to attack some standard bionicle pieces (like a Bohrok shield maybe).
Other than that though, It looks good! If you can, you should make Macku next (and most of you know where I'm going with this).