From an image on Pixabay, in turn obviously from Alberto Korda's famous photo. Made the star on the cap show better and thought an extra shade was required over and above the black and white image often presented.
This is a completely free image Che Guevara that you can download, post, and use for any purpose.
Image License: CC0 No Rights Reserved
You can copy, modify, distribute and perform the work, even for commercial purposes, all without asking permission, and at no cost. This image is completely free.