Including visualizations can help your poster stand out and help others understand your research. There are lots of ways to include visualizations on your poster - graphs, charts, photographs, as well as many others.
Other Visualization Resources:
Using multiple font styles can really make your poster stand out and look professional. Consult this graphic to understand different font styles, what fonts work best together, and what fonts to avoid. Link to online PDF of graphic.
Disclaimer: While Comic Sans is sometimes called an inappropriate font, in reality it is one of the best fonts for people with dyslexia.