I'm not sure if maybe I'm reading too much into this, and perhaps the joke was just that the seemingly perfect Uika, who can do anything, happens to be bad a taking pictures. But if I'm right, I really like that detail. It would show she's finally seeing some colour in her life.
I was thinking about that Oshitabi with Uika and Nyamu, and the former's inability to take a proper picture. That always surprised me a bit, considering how she's glued to that bloody phone. Furthermore, she's a 15yo zoomer, you would think taking good pics would be as natural as breathing to her.
I believe we usually take pics of things we like either to save those memories or to share our experiences with others. So, I was thinking that Hatsune is bad at taking pictures, because there was no memory she cared about saving or sharing, until very recently that something has changed inside her.
