I personally have a word/photo essay blog and I love keeping all my images in flickr, then integrating them in the site with falbum.
https://www.randombyte.net/
I also use the flickr posting bar for WYSIWYG post editing:
https://tantannoodles.com/toolkit/wp-flickr-post-bar/
I configured it so it inserts relative links back to my site itself. For me the falbum shows up in /photos/
on my site, so when I configured flickr post bar I used following the custom insert:
/photos/show/recent/photo/$PHOTOID/
Flickr handles all my images, but users never see that.
As a note: I did integrate Gallery2 into my test site on my home server, but I never much liked working with Gallery2… its too complex for easy painless posting. Flickr has been worth the money for me (I post Gigs and Gigs of photos)
hope that helps!!!