Try changing the frame numbers and see what you think about the difference between each of these frames. I have made 001.gif 010.gif and 019.gif click-able to make it easy. Note that 001.gif and 010.gif are very slightly different. That 001.gif and 019.gif are very different. Giving more movement to the animation if you were to select them to loop together to create a animated image.
Here is the sub-directory I animated
the image with. Loopy