Hi @Hollyqwe,
Welcome to the community
I'm sorry to hear this. If you accidentally delete pictures you need to have a available backup to be able to restore them. If you have made a backup of your device I recommend that you restore all availible photos from it. There are also apps like Google Photos that can backup photos automatically. If you have logged in to Google Photos prior to deleting your photos I recommend that you restore the photos from that app.
There are also some third party apps that can restore deleted data, but as far as I know those need to be installed prior to deleting the photos. If you have a app with a recovery function installed I recommend that you try to restore your photos with that app. There is no app like this pre-installed on your device.
Let me know how it goes.
