You might want to try Yahoo Japan (IIRC, there is
a cel up of GR2 right now).  That's where I was
finally able to get a Big Fire cel :D.  Also, I've
seen an interesting variety of characters and
scenes up, they seem to come in waves though.

I believe I've also seen more nice shots of the
'minor' characters at Anime Link and at Asylum
Anime, especially during conventions.  You might
want to contact them and see if they still have
any.  I've seen others scattered about too but
nothing sticks out in my mind at the moment ^^;

Keys