How to get deleted picture in your Samsung m series

[Who1]

just go to Samsung gallery ( Not File manager)

then 

in the gallery at right upper corner you find a more option logo > click 

there you get recycle bin option

here you get all yours deleted photos..

[Who1]

one thing you are able to get picture before 15 days

[Peen2]

Information/Assistance is very helpful.

[Anonymous]

don't you have backup sync