Reference of finished painting
Step one: first draw an ellipse.
Step 2: Draw two eyes with circles on the front and add black eyeballs.
Step 3: Then use arc lines to draw its fins on both sides.
Step 4: Then use curved lines to draw the tails on both sides behind the ellipse.
Step 5: Use a long arc to draw the middle tail, and also use curved lines to draw the decorative lines inside the tail.
Step 6: Finally, apply a nice color, and the goldfish is now painted.