Bet river for value?

When should I bet the river for value with TPTK after being called down/

Would you reccommend a value bet here (op has ~$6 at river and pot is $33)

Note: Ops first hand at table, he has posted Blind Bet out of the blinds *

** Town Range [Hold 'em] (0.15|0.30 No Limit - Cash Game) Real Money

- markymark32 sitting in seat 2 with $21.43
- donzolo sitting in seat 3 with $83.78
- SinkRox sitting in seat 4 with $30.70
- gumboot sitting in seat 5 with $19.35 [Dealer]
- s2racing sitting in seat 6 with $0.00 [Sitting out]
- ScruffyG sitting in seat 7 with $0.00 [Sitting out]
- gast sitting in seat 8 with $41.36
- MarkGardener sitting in seat 9 with $49.11

gast posted the small blind - $0.15
MarkGardener posted the big blind - $0.30
markymark32 posted to play - $0.30

** Dealing card to SinkRox: Qs, Ah
markymark32 checked
donzolo folded
SinkRox raised - $1.50
gumboot called - $1.50
gast folded
MarkGardener folded
markymark32 called - $1.50

** Dealing the flop: Ac 8h 6s
markymark32 checked
SinkRox bet - $3.30
gumboot called - $3.30
markymark32 called - $3.30

** Dealing the turn: Kh
markymark32 checked
SinkRox bet - $10.20
gumboot folded
markymark32 called - $10.20

** Dealing the river: 7h
markymark32 checked
SinkRox ...