Good communicators adjust what they say and how they say it to suit the audience they're aiming at. They make you feel they are talking only to you. Being approachable is all about tailoring our communications to our audiences. We think about what they want to hear (rather than just what we want to tell them). We put ourselves in their shoes, then distil our message down to simple words that can be expressed succinctly and clearly.
We use everyday language whenever possible and avoid jargon. Formality puts a barrier between people, so we use an informal tone of voice, although we recognize that we sometimes need to adapt it to different audiences and cultures. We use 'I' and 'we' rather than always talking about an impersonal 'Shire'. We like to talk directly to people, so we use 'you'. We personalize our communications as much as possible.
This informality extends to how we look. We don't always wear suits at work, so we don't have to wear them in photographs either. We're individuals, we're open and unstuffy and we don't hide behind a corporate uniform.
APPROACHABLE is not... Flowery, Over-familiar, Chatty, Creepy, Status-ridden, Unprofessional.