[r-a-y]

Try BP-Media:
https://buddypress.org/community/groups/bp-album/

There’s also a paid plugin for this as well:
http://buddydev.com/plugins/bp-gallery/

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As for members list, you’ll have to either use a plugin or code something that restricts access to that as by default, everything is open to the public.

And regarding a forum for signed-in members, currently BuddyPress uses a concept called “Groups” (much similar to Facebook’s fan pages). Forums can be enabled on a per-group basis, and groups can be public, private or hidden.

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Hope that answers your questions for the most part!