NL25 0.1/0.25 100BB nodata
Preflop: 2folds, CO open 0.63 (2.6bb) ,2flods, BB(Hero) 3bet 1.99 with TdTc, CO call
Flop: Qc4d6d pot 4.08(16.32bb) hero cbet 1.35 （1/3pot ）, co call
Turn: 4h Hero check , CO bet 3.39 (0.5pot) , Hero call
River: 3c Hecro check, CO bet 10.17 (0.75 pot) , Hero fold

whats his range here? I think i can call here. his bet seems like a bluff, or over pairs 66 full house A4s value for a Q??
i dont think he has a straight here. if he has 56s 77 88 99 he can show down to win A high K high.
it looks like a bluff i think.

maybe my cbet on flop is also not good here? how about check call or check-raise on flop?