Depending on how you upload/download the picture usually hints at why the resolution drops. As an example applications can sometimes show you a ‘preview’ image but you actually need to open it fully prior to download. Messaging apps also have a tendency to lower resolution.
Nice mask! I like the inclusion of the iconic knife.
Great job. Been looking to do that myself and I got somewhat close. Getting an actual Polaroid camera this month to try and take a real shot but here’s what I got.