Trigger the LoRA with "Polaroid frame of"
I've cherry picked images that have good looking frames, but they don't always appear. These dimensions will get you the actual Polaroid aspect ratio (and are more likely to generate a correct frame):
1216x1408
896x1024
832x960
704x832
640x768
512x608
Fun things to try:
"Written at the bottom of the Polaroid in marker is the handwritten text, Your text here"
"A hand holds a Polaroid photo of..."
"Distressed, faded and beige Polaroid frame of..."
Big thanks to SeatownSin for financing several rounds of training!