Who Did You Give Amabie's Bromide Photo To?
To my knowledge, there's no alignment points tied to your decision, so it's a pure flavor choice, which is both rare and welcome in SMT games, who you decide to gift with Tokyo's 2nd best demon idol photo.
Dazai takes it as a sign that the MC is shy about talking to him and quickly reassures MC that the two are friends, and he doesn't need gifts or anything. Afterward, Dazai wonders if he can make a video using the picture, which helps Amabie's purpose in giving the photo to you in the first place.
Yuzuru's confused by it, but upon realizing that it's akin to a good luck charm, he instantly makes it one of his prized possessions hoping that it'll help him 'protect Tokyo'.
This one isn't inherently funny, but just the thought of Yuzuru carrying around a weird slimy photo of a fishy demon idol makes me chuckle. Also, I feel Amabie would appreciate Yuzuru carrying her photo around.
Tao just busts out laughing when you give it to her. She's less appreciative of the photo itself and moreso the act of giving her something. She'll probably keep it in her notebook to look at from time to time to cherish as a fun memory.
Giving it to Tao doesn't seem to help Amabie's goal too much, but I feel like if any of Tao's friends saw the photo, it could get around in circulation just by virtue of sharing.
Miyzau's undoubtedly treasures the photo the most of anyone. Once you tell her that it's a spirit for good health, her gratitude shoots through the roof. 100% she's starts carrying it everywhere as well as sleeping with it beside her.
Then finally, Yoko is just weirded out by it. You give it to her and immediately lose cool points in her head and gain weird points. Honestly, the worst option. Truly, Yoko can't appreciate culture.
So yeah, it's a pure flavor choice that just gives some much needed fluff to some very underdeveloped characters.