Draw a small oval or teardrop shape for the shell’s base
Add a curved spiral line starting from the center
Build outward with larger curved sections around the spiral
Shape the outer edge into a rounded fan or scalloped form
Draw several radiating ridges from the center to the edge
Add curved lines between the ridges to show shell texture
Refine the outline to make the shell look symmetrical
Erase any extra sketch lines
Shade along the ridges and inner curves
Darken the spiral center and outer edges for depth