Start by drawing a circle that will serve as the main part of the glass cover of the bulb.

Erase some of the lines below the circle and connect two inward converging arcs at the ends of the notches to complete the glass cover.

Below the glass cover, draw three flattened rectangles in descending order to represent the spiral metal part of the bulb, and a small semi-circular shape at the bottom to serve as the tip of the bulb.

The next step is to draw the filament, which consists of two straight lines and a spiral inside the bulb.

After drawing the bulb, you can also draw a few short lines around the perimeter to show the light of the bulb.

Finally, fill in the color of the bulb and you are done.