1. First, create a new document with the RGB color mode of 1280*720, and use the rectangle tool to make a rectangle.

2. Secondly, fill the rectangle with color, center it horizontally and vertically, draw an ellipse with the ellipse tool, and fill it with another color.

3. Finally, draw the shape of the small tail with the pen tool, select and merge all, draw three circles with the ellipse tool, copy and move the bottom layer, subtract the unnecessary parts with the shape generation tool, and change the bottom layer to dark color.