Stressometer

I'm working on a webdesign for a stresscoaching firm, and we are also assigned to create a test where users by answering a few questions can figure out how stressed they are. So as a little practice i created this Stress-O-Meter, that goes from green to yellow to red to black (4 levels of stress.... Hopefully the client enjoys it, and accepts to develop a final moving and colorchanging stress-o-meter. ANY tips on how to improve it are very much appreciated :)