I have tried a few new things with this image, I approached the colour in a similar way to cell rendering in animation and the way that I applied the shadow gives it a slight manga look I feel. I recently watched 'spirited away' again which may have had an impact here.
I have made some designs available for sale on redbubble. They are quite reasonably priced and the tshirts come on American Apparel stock so you know what you're gonna get.
Creativity is a fickle beast. Sometimes the juices refuse to flow, other times you see something that commands you to draw it. In this instance it was my shoe.