YES- It is an Albert Fine fish, according to Marie Tavroges Stilkind... It could be none other than Phil Glass who received that postcard. (See the postcard below). Marie worked at Julliard back in the day. From time to time dear Marie sends me envelopes of gatherings and gleanings... odd fodder and New Beginnings.
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Albert Fine and Phil Glass, "Fishy Greeting from 1959"
(OOPS comment on wrong posting) Oh, so you put together the Albert Fine photo, his fish drawing and envelope to Phil Glass...I didn't realize that "Albert Fine, Fishy Greeting, postmarked 1959" was a title for your collage...synapsis..aha!