This vector illustration isn't quite as nice as the first two and there's a good reason why.  I decided to pick a random object and see what kind of drawing I could come up with.

Here's the result.  Hopefully it's obvious, but my goal was to draw a gift wrapped box.  About half way through this I realized that the shadows were all coming from different directions which made it look really off.  I still need to figure out how to handle shadows better, but focusing on that helped a lot with the overall look.

I'll probably get back to the tutorials before trying anything else on my own, but I'm pretty happy with what I've learned so far.