I was thinking of hair loss and I was thinking of using a Sharpie permanent marker on my scalp. But then I thought of tattoos...
I did a search and found that many people have done this.
Here's a guy who does micro tattoos on scalps to "restore" hair.
If you're using Debian, use Synaptic Package Manager. And similarly use your linux distro's package manager. Look for openshot, one word. Installs without a fuss. You will find an icon in your start menu.