Nikolay Nikolaus has just posted a number of wonderful old images, photos, sketches, paintings etc., of Fort Ross
on the "Friends of Fort Ross" Facebook
. It does look like you have to be logged in on Facebook to access their page, unfortunately. Here are a few of the images.
A number of photos from 1886 are linked to here http://content.cdlib.org/ark:/13030/tf487007v0/
See also earlier posts Annual Pilgrimage and Picnic at Fort Ross, May 31
and Fort Ross 2012 Bicentennial