I think the design was fine. Be happy that you finished so quickly. If you want to eat up more time, try painting a texture map for it, build an environment for it, or develop the controls for the skeletal rigging and get it animated. You can use the time to push your skills and learn more. Just my two cents.
Great work btw.
AIM: mhcannonDMC
"If you love your job, you'll never work another day in your life."