Step one:
First draw a circle.
Step 2:
Then draw a small polyline around it.
Step 3:
Draw a line at the tip of each small polyline to connect it to the circle, and draw a small arc inside the circle.
Step 4:
Draw two vertical lines below to connect them.
Step 5:
Then draw small polylines on the inside to form the texture inside, and add some small dots on the outside.
Step 6:
Finally, apply a nice color and the sea anemone is ready.