Again, thanks! Works out of the box as descriebe! ;)
What about changing/adding option to select editor's gravatar? :) (in place of the admin's gravatar if I correctly set/test your plugin ;))
(my gravatar is nice, but not all of the people love it! :D )
Anyway, good as it allow to setup (which I'm going to do) a default image (web site logo'll be nice ;)).