I put up cels based on the rotating-series-when-
I'm-not-being-lazy method.  It's very random ^^;  
I try to put a few up at a time, partially to 
highlight them and partially because I liked 
doing things little by litte (er... back when I 
updated more regularly ;_;).

I try to put up all sorts that I like and feel 
like talking about at the time.  I do group the 
cels with more blank space together so that the 
bigger cels don't pick on them (and so that 
they're not so easily dismissed by passers by for 
the other ones).

I get great amusement out of miscellaneous cels, 
unknown cels and bargain bin cels myself... every 
cel is special in it's own way.

However, it's your gallery.  If you don't like 
seeing them elsewhere, perhaps you shouldn't put 
them up.  If you want to see them in your own 
gallery, then put them up.  If you don't want to 
scan, then don't