Open WhatsApp and go to the chat with the profile picture you want to capture
Tap the contact name to open their profile info
View the DP in full screen if available
Use your phone’s screenshot shortcut
On Android, press Power + Volume Down
On iPhone with Face ID, press Side Button + Volume Up
On iPhone with Home Button, press Home + Side Button or Home + Power
Check your gallery or Photos app for the screenshot
If the DP is not visible in full screen, ask the person to send it to you directly