Find all the painting pieces to unlock the door.

Hi! I am a noob at ue5 but am doing a project for school - one of the things i need to code is a puzzle where the player needs to collect all the painting pieces to unlock the door (kind of like the granny painting mechanic) it is on but I have been looking at youtube and can't find any videos. I only have a week left to do this part and its the last thing I need.

If anyone has any specific videos or reddit thread that they could link me too that has detailed instructions that would be great!