At some point I want to develop and release a gallery extension for Connections but it will likely be a bit of time before I get to it. What can be done now … two things:
First, the bio and notes field support the HTML
img tag. so you can add as many images as you want using those.
Second, the bio and notes fields also support shortcodes. You can use a gallery plugin which displays galleries via shortcodes.
Hope that helps!