Krita  Krita

Krita is a very good free drawing and painting app with animation options too.

Krita is less than 500 mb to download and install.

FREE unless you want to do so via the Windows Store for £8.19 or Steam at £6.99 for the same product, with the advantage of easier automatic updates – and less risk of virus problems: the official link was infected according to AVG on 3rd March 2021.

There is also a portable version which allows you to run it from a USB stick or bypass admin password restrictions.

To render animations, Krita needs an additional small free open-source program called ffMPEG. For details see the manual link here