No need to try and reinvent the wheel! There are many reputable websites and resources that offer ideas on how to create an effective poster for displaying your humanities research.
Here are some options you may find helpful as you begin to think about designing your poster:
https://www.ugresearch.umd.edu/documents/DesigningPosterForHumanitiesAndSocialSciences.pdf
https://guides.library.illinois.edu/poster/home
https://www.aucd.org/docs/annual_mtg_2008/accessibility_posters_gilson2007.pdf
https://edu.gcfglobal.org/en/powerpoint2016/