Hey Luis,
You can post an image from photo-album in your blog by doing the following (if photo-album is mounted at "/photos"):
<a href="/photos/photo?photo_id=PHOTO_ID" border=0><img src="/photos/images/THUMBNAIL_ID"></a>
You will, of course, need the proper permissions on the PHOTO_ID object for a user to view that photo.
Let me know of anything else.
