Yes, my profile picture is my MC skin. However, my skin was originally made in PMCSkin3D. This version is a replica that I made in BlockBench (available as a desktop program or a web app). Both of these pieces of software are completely free.
Fun Fact:
According to Minecraft Live 2022 (available on YouTube), BlockBench is used by many Minecraft Marketplace creators.
Here is a full image of my MC skin: