Materials used:
• 2B Pencil
• A4 Paper
• Eraser
• Reference Image [copyrighted]
Below are images showing the different stages of the drawing of the lightbulb.
First I made an outline of the bulb's body
Then I added some more details and thickened the lines
I added more details and some sort of guides to help me in shading.
I finally added shading as much as I could see on the Reference Image.