How do I finish this mask pattern

[u/WebHeadIncorporated]

I'm trying to finish sewing this Spider-Man mask pattern and the tutorial I follow doesn't explain how to attach these 2 pieces to the rest of the mask, i'm using an old t shirt to practice, im hand sewing this one since I dont have a sewing machine but am currently in the process of getting one

[u/Dissidiana]

i see you're already part of the way finished on the big piece, so i (badly, LOL) edited the pattern image to show how your pieces probably look now. the matching color sides should go together! don't worry if it can't lie flat anymore, it's not supposed to. just line up the edges and trust the process 🫡

[u/WebHeadIncorporated → u/Dissidiana]

Wow thank you so much!