I mostly use GIMP.
I am also enthusiast about the https://graphite.rs/ project which is working in browser (love it or hate it for that).
Krita is amazing for drawing but may be intimidating.
I like MyPaint that I use as a whiteboard. It is easy to use and convenient
You won’t have the same look and feel but https://cryptpad.fr/ sometimes works for me. This or a nextcloud instance.