I've been trying get this working since episode 5 of the Spoof Series Show came out, but I couldn't find a decent reference. Failed sketches of this are scattered through all my sketchbooks from the last 9 months, and I'm so pleased to have finally done it! And in the end I didn't need a reference (but I did trace my foot onto the page ^^" I have small feet).
For a step-by-step tutorial of this artwork, see here.
Others in this series:
Naruto (c) Masashi Kishimoto and TV Tokyo Naruto the Abridged Comedy Fandub Spoof Series Show created by Little Kuriboh