Draw a small oval for the bulb base
Add a wider rounded shape above it for the glass bulb
Sketch a narrow neck connecting the base and the bulb
Draw a filament inside the bulb
Add two support wires from the filament to the sides
Draw screw lines or ridges on the base
Outline the shape with smooth, clean lines
Erase any extra sketch marks
Add shading to give the bulb depth
Darken the final lines for a finished look