This one is mine:
[Chat Chit] DMM FKG-fairy-chan.jpg

As you can see I´ve been feeding her lot (saved over 300 stamina pots so burned few of those to grind the event so she can grow bigger :3 ) so the stat bar on the right is pretty much maxed out.
I think her appearance might be either which color gem you fed her the most, or which was the color you fed her as the first one.

Anyone with blue or yellow fairy pic to share ?