1. The shoes: They are well captured, but it would be nice to see a little bit more of the hands tying the shoe. In fact, the avatar would look better if it only shows the shoe being tied (in my opinion). In addition to that, the angle of the shot should be less steeper with respect to the horizontal plane. To me, the image looks more than decent enough.
2. The message and effects: Very hilarious. The effects are also nice.
3. Size: To me, I think the size this avatar is submitted is probably the smallest it can be. If it were to be shrunk for DA, It would be very difficuly to see the words.
4. Color scheme: Good, nothing more to say about it.
Overall, this avatar is good and in some ways funny.