Gem Hi there. First thing: don’t use the SD card any more than you already have. Apps on tablets are pretty limited, and trying to recover files directly on the tablet is usually not the best move.
The most effective move is to take the SD card out and connect it to a computer with an SD card reader. Recovery software on a PC or Mac is way more powerful and gives you the best shot at getting those photos back.
If you want step-by-step guides that show exactly what to do (and what to avoid), here are a couple that walk you through it:
