Draw a simple oval or tall rounded shape for the cactus body
Add one or two smaller rounded arms on the sides if desired
Sketch a few vertical curved lines from top to bottom for ridges
Add short small spikes or tiny lines along the ridges
Draw a small pot or ground base under the cactus
Add soil or sand inside the pot if needed
Outline the final shape with a darker pen or pencil
Erase extra sketch lines
Color the cactus green
Color the pot brown, red, or any preferred color