I am guessing this is quite low stakes? I wouldn't c bet this board since people just arn't folding enough on two tone 79K boards. They will call with a tonne of draws like QT, QJ, diamonds, T8, 68, then any 7x, 9x, Kx hands, any Ax with A of diamonds hoping to hit a diamond on the turn so that they can raise you if aggressive or just try to see if they can get running diamonds since they are passive. C betting this flop isn't terrible though since if he is pretty loose you can get him to fold out a fair few air hands and maybe he isn't bad enough to call with stupid crap since he is unknown. When he does call though I would just give up on the turn against an unknown at lowstakes. I am sure you could bet that 2 again and just rep the K but I think against a bad player they will want to see the river if they have any kind of draw. They got this far with their gutshot, right? There is no point betting this river unless you had a solid read that this guy can get here with like 9x, TT, JJ, QQ, and can fold to a large river bet.Your turn bet sizing isn't too good either. If it was 10/20 and you raised to 50 thats 100 in the pot preflop. You bet 65 on the flop for 165 now you bet 150 on the turn? You need to bet a bit less. 65 on the flop isn't a big mistake, but I think 60 is better. On the turn though you could have done the exact same thing with 120 chips that you could with 150. If you bet less on the flop the turn would actually be 155 now and you could go ahead and just bet 100 - 110 chips.