10nl: TPTK bet sizing

[Ikaika]

Villain was standard 10nl 1st level thinker, weak passive etc. I put him on a weaker J or NFD, and I feel like I missed out on a dollar or two on the river here. I think one of my major leaks is bet sizing when I value bet; how is my bet sizing throughout this hand?

PokerStars No-Limit Hold'em, $0.10 BB (6 handed) Hand History Converter Tool from FlopTurnRiver.com (Format: 2+2 Forums)

saw flop|<font color="#C00000">saw showdown</font>

CO ($9.75)
Button ($11.05)
SB ($1.20)
BB ($3.70)
<font color="#C00000">UTG ($15.20)</font>
<font color="#C00000">Hero ($12.35)</font>

Preflop: Hero is MP with J[img]/images/graemlins/diamond.gif[/img], A[img]/images/graemlins/club.gif[/img].
UTG calls $0.10, <font color="#CC3333">Hero raises to $0.5</font>, <font color="#666666">4 folds</font>, UTG calls $0.40.

Flop: ($1.15) 2[img]/images/graemlins/club.gif[/img], T[img]/images/graemlins/spade.gif[/img], J[img]/images/graemlins/spade.gif[/img] <font color="#0000FF">(2 players)</font>
<font color="#CC3333">UTG bets $1.1</font>, Hero calls $1.10.

Turn: ($3.35) 4[img]/images/graemlins/club.gif[/img] <font color="#0000FF">(2 players)</font>
UTG checks, <font color="#CC3333">Hero bets $2.35</font>, UTG calls $2.35.

River: ($8.05) 4[img]/images/graemlins/diamond.gif[/img] <font color="#0000FF">(2 players)</font>
UTG checks, <font color="#CC3333">Hero bets $3.2</font>

Final Pot: $14.45