CRACKED IT! Sorta!
Ok so i figured out how to search by artist properly, i think, the above method, whilst useful, doesn't hit everything that that artist did (I think its just searching that 'fave gallery" for art by that artist and not the whole site.
But typing or copynpasting the artists name into the 2nd (the one on the right) search bar on
http://t-on.jp/omc_gallery/gallery.cgi does the trick, That takes you to the first results page, where you've then got to click the artist's name. Thats the proper main search I think (and I have a sneaking suspision that that left hand search bar is the search by topic (eg "tf") function, but we'll need to find what 'transformation' is in japanese, and its 2am so i'll do it in the morning.
(when you are in the artists "gallery" you gotta click on the pics, can't open em in a new tab or anything =() gotta view em one at a time.
Sorry to necro a months old thread but felt this warrented it, wasn't about to make a new thread for this =P and no-one would have seen the 'breakthrough'