Draw a rectangle for the monitor
Add a smaller rectangle inside for the screen
Draw a stand beneath the monitor
Draw a base under the stand
Draw a rectangle or box shape for the computer tower
Add a power button on the tower
Draw a keyboard as a long flat rectangle
Add small key squares on the keyboard
Draw a mouse beside the keyboard
Outline the shapes with darker lines
Erase extra sketch lines
Add simple details like vents or buttons
Color the monitor, tower, keyboard, and mouse