Hi, @DLS (Daniel LaSalle) 
When I want to take more "advanced" screenshots, I use "Flameshot":
In my case, I use the so called "Snappy Edition" of Flameshot (snap version of Flameshot):
Why do I use Flameshot? Because of its features, as explained in that "Install Flameshot on Linux | Snap Store" web page:
" (...) A powerful open source screenshot and annotation tool for Linux, Flameshot has a varied set of markup tools available, which include Freehand drawing, Lines, Arrows, Boxes, Circles, Highlighting, Blur. Additionally, you can customise the color, size and/or thickness of many of these image annotation tools. (...)"
Here's an animated GIF that is also in that same web page and that displays the features of Flameshot in use:
I hope this reply of mine is useful