to anyone wondering, yes, the numbers in the background of the finished work are indeed Binary. It's a letter to Futaba's mother. even though it's jumbled all together, this is what it translates too.

"Hey Mom,I hope you're doing well.I made some new friends. One of them is Inari. He's weird, irritating, and a pain to be around. And yet, I feel like I can be myself around him. Along with Akira and the others. Thanks to them, I've been able to remember so much. I became a member of the Phantom Thieves, helped so many people, and saw some really cool things! I Just wanted to thank you mom...and...and I love you."

References:
Pose: https://www.deviantart.com/squidwardbases/art/Base-Model-17-531180866

Design: https://megamitensei.fandom.com/wiki/Futaba_Sakura?file=P5_Futaba_Sakura.png

Portrait: https://megamitensei.fandom.com/wiki/Futaba_Sakura?file=P5_portrait_of_Futaba_Sakura.png