Add a META.json to the distribution. Your buildtool should be able to autogenerate it.

Add tests or move tests.pl to the t/ directory!

Define the license if you are using in Build.PL. If you are using MakeMaker (Makefile.PL) you should upgrade to ExtUtils::MakeMaker version 6.31.

Add 'use warnings' (or its equivalents) to all modules, or convince us that your favorite module is well-known enough and people can easily see the modules warn when something bad happens.

Error: Image::Filter, Image::Filter::Blur, Image::Filter::Channel, Image::Filter::Edge, Image::Filter::Emboss, Image::Filter::Eraseline, Image::Filter::Floyd, Image::Filter::Foo, Image::Filter::Gaussian, Image::Filter::Greyscale, Image::Filter::Invert, Image::Filter::Level, Image::Filter::Oilify, Image::Filter::Pixelize, Image::Filter::Posterize, Image::Filter::Ripple, Image::Filter::Rotate, Image::Filter::Sharpen, Image::Filter::Solarize, Image::Filter::Swirl, Image::Filter::Twirl

Add SECURITY(.pod|md). See Software::Security::Policy.

Add SECURITY(.pod|md) and add a contact address. See Software::Security::Policy.

Add CONTRIBUTING(.pod|md). See https://docs.github.com/en/communities/setting-up-your-project-for-healthy-contributions/setting-guidelines-for-repository-contributors.