Follow the style guide. The Guix style guide outlines conventions for package definitions, including naming, indentation, etc. Following this will make your package blend in with the rest of the repository.
Include descriptive commit messages. When submitting a pull request, include a commit message that summarizes what your package definition adds. Mention the purpose of the package, what version you packaged, etc.
Test your package. Ideally, you should test your package definition locally to ensure that it builds and installs correctly, and that the resulting package works as expected. Mentioning that you tested it in your pull request is a plus.
Be responsive to feedback. The Guix maintainers may provide feedback or suggestions for improving your package definition. Be responsive to this feedback, make changes as needed, and push updates to your pull request. This shows you are engaged and interested in getting it right.

In general, showing that you are thoughtful and diligent about your package definition submission will increase the chances that it is accepted. The Guix developers appreciate high-quality, tested package definitions, so putting in the effort to submit something polished is worthwhile.
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