Original from the source.
It's the Apocalypse Charlie Brown! by SeanE on DeviantArt
Ever since Lucy had finally gone too far in her quest for power and launched the nuclear apocalypse, Charlie Brown had roamed the wastes watching his Peanuts gang being whittled down one by one until only he and his faithful beagle; Snoopy IV were left.... But he would never give up, never. Not until he found the little red haired girl.
She was out there... somewhere...