Galleryful

An essential part of the scheme was the " Gallery Lesson " conducted by specially gifted teachers who spent the whole day in dealing with a large galleryful of children, made up of several classes grouped together for this purpose.

Source: wiktionary

Sex, the subject of librariesful of books, galleriesful of art and even, as we have seen, an occasional laboratoryful of science; the object of inquisitions and persecutions, of worship and reverence; the star of subliminal advertising, the glory of morning glory and the power of the sunflower, the Shaper of the lotus-yoni and mighty Priapus, the three-letter word that rhymes with hex—sex, created by evolution to speed up the dance (so say the Evolutionists), used by the Horned One to ensnare human souls (so say the Creationists).

Source: wiktionary

Indeed, not one portrait, but a whole galleryful would be required, for there are ever so many Mr. Shaws

Source: wiktionary