If you're actually using Windows (you mention MS paint), there's built-in functionality to doodle on screenshots. It's built on the same tech as e.g. onenote so

If you're actually using Windows (you mention MS paint), there's built-in functionality to doodle on screenshots. It's built on the same tech as e.g. onenote so it's surprisingly good. Just press win+shift+s. For an existing photo/screenshot, just open it with the default image viewer and click modify. And the "pro-tip", if I may: when you take a screenshot, it gets copied in your clipboard. Try pasting it somewhere. It works in an astouding number of places.