Milkslap
Disclaimer: I did not solve this during pico. Overall approach was taught by a friend.
Overview
Category: Forensics Points: 120
Description
Approach
Ctrl + shift + I on the website of milkslap and track down where the image is located
Use the one and only stegsolve and:
Analyze > Data Extract
then select Blue 0
and click preview, scroll to the top:
Flag
picoCTF{imag3_m4n1pul4t10n_sl4p5}