The pin numbers in the image of the wiring diagram are not readable.
Are the pins that you have connected the same as here:
//LiquidCrystal lcd(RS, E, D4, D5, D6, D7);
LiquidCrystal lcd(7, 8, 9, 10, 11, 12);
The schematic shows how it should be wired. Post a readable schematic.
Photos of the actual wiring show how it is wired. Post photos of the actual wiring and LCD.