Use a photo editing app with a sketch or pencil filter
Open the picture in the app
Select a drawing, sketch, or line-art effect
Adjust contrast, brightness, and edge strength if available
Save the result as a new image
Use a tracing method
Place the picture on a light table or screen
Put a blank sheet over it
Trace the outlines with a pencil or pen
Add shading and details by hand
Use a digital drawing app
Import the picture into the app
Lower the opacity of the image layer
Create a new layer above it
Draw over the image with a brush or pen tool
Hide or delete the original layer
Use an online image-to-sketch converter
Upload the picture to the website
Choose a sketch, pencil, or cartoon style
Download the converted image
Use manual editing software
Open the picture in Photoshop, GIMP, or similar software
Convert the image to grayscale
Increase contrast
Apply edge detection or posterize effects
Refine the lines and shading
Print the picture and redraw it
Print the image on paper
Place a blank sheet over it
Trace the main shapes and outlines
Add details and textures by hand