Here's a thought: First analyze the target groups and create a generalized idea of what the people you are reaching out are like. Now P is for People. Then find a (random) bunch of actual living and breathing people fitting your general type. See what really are like, what they do, who they talk with. Know her by name, know the little differences which set this individual apart from the group, from People. Now P is for Person.
Here's another thought: Use social media for this. Find these Persons from your social media contacts. See what sort of things they post on Facebook, LinkedIn, Twitter and beyond. Read their blogs, view their photos and see what other social media platforms they use. Contact them, have conversations with them. Make it personal.
I'm Mervi Emilia Eskelinen, an artist, and a multi-talent of web visibility and branding from Finland. I help indie businesses, freelancers and bloggers to stand out online. I have 18 years of experience and a formal education in everything about web design and development, branding and online marketing.