Another reminder about heron names . . .
There is no such bird as a "Little Green Heron." The bird might be small, but both the North American and international ornithology committees have long called
Butorides virescens and its subspecies "Green Heron."
It has become a convention among ornithologists to capitalize bird common names, so "Green Heron" is preferred over "green heron." This helps avoid confusion. For example, "Did you see a yellow warbler (many warblers are yellow in color) or a Yellow Warbler (specifically
Setophaga petechia)?
So while you followed the capitalization convention correctly, you applied it to a bird name that doesn't exist.
But it would be accurate to say "I photographed a
little Green Heron."