Before you start throwing dirt on the coffin.....check for a pulse after it cools down!
Get the oil level back up and check oil cooler and oil cooler lines for leaks.
Remove the glow plugs or injectors and shoot some transmission fluid (yes the red stuff) into the combustion chambers and let it soak the pistons and rings (overnight). Then try bumping the engine with the starter until it loosens up and spins over without compression. Once it turns freely put glow plugs or injectors back in and try starting/turning her with full compression on a fully charged battery. There may be some heavy smoke as she burns off the stuff you poured in there.......and listen for unusual bearing noise or piston slap. It may be salvageable...........
Good Luck

__________________
FRED

Daily Driver: 98 E300TD 199K
Hobby Car: 69 Austin Mini
Past Diesels: 84 300SD, 312K
87 300SDL, 251K
94 Chev. K-1500 6.5Ltr.TD, 373K