Guys, the MOST important thing to do with the test pieces is follow instructions. Shading is nice and what-not but it hides structure, line quality and everything they're really looking at. The requirement says in bold to not shade the household objects piece. Just to be safe I wouldn't shade anything really. Sorry man, its probably a bummer since it looks like you spent quite a bit of time on this.
Always be clear on what they are asking for.