One potential non-immediate benefit could be 3D reconstruction and dimensional estimates which could be derived from multiple images by future researchers. There is already significant progress on recreating entire 3D scenes from a single image. e.g.
And tools designed for photogrammetry using multiple images already exist, although these tend to be naive with respect to complex and moving creatures such as birds and butterflies, however one could envision the extension of tools specifically adapted to those needs:
Also, as someone who has done several image analysis projects for or in collaboration with other researchers, having extra images is always helpful. As others have noted, they can function as a kind of insurance. That particular spot on the wing of some Lepidoptera species might only be visible in one of your photos.