Auto value bet on river?

[RocketPiquette]

Limit .50/1 10 handed

First hand at the table

Hero is BB [Kd,4s]

UTG calls, 4 folds, CO+1 calls, CO folds, Button calls, SB calls, HERO checks.

FLOP [QH,6D,KC ]

All check to button, Button bets, Hero raises, all fold to button, Button calls.

TURN [QH,6D,KC,2D ]

Hero bets, Button calls

RIVER [QH,6D,KC,2D,6C ]
Hero checks, Button checks.

On the flop, I check and plan to fold unless button bets, which happens here. So I raise, to shut the field, which happens also. I assume I lead, so I bet the turn, planning to fold to a raise, which doesn't happen. But what on the river? I thought inducing a bluff was my best option. Any comment on the hand as a whole, and on the river would be appreciated.