3/6 hu hand vs. semi-unknown

[luckychewy]

only played with the guy for a little at 6max but he didn't do anything of note although i get the feeling he may be slightly donkish. anyway, here's the hand, thoughts on river bet? i think the other 3 decisions are ridic standard and what's your play if you get c/r'd?

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

Hero ($611.20)
BB ($926.90)

Preflop: Hero is Button with J[img]/images/graemlins/spade.gif[/img], 8[img]/images/graemlins/spade.gif[/img].
<font color="#CC3333">Hero raises to $18</font>, BB calls $12.

Flop: ($36) Q[img]/images/graemlins/club.gif[/img], 4[img]/images/graemlins/spade.gif[/img], Q[img]/images/graemlins/spade.gif[/img] <font color="#0000FF">(2 players)</font>
BB checks, <font color="#CC3333">Hero bets $30</font>, BB calls $30.

Turn: ($96) 3[img]/images/graemlins/spade.gif[/img] <font color="#0000FF">(2 players)</font>
BB checks, <font color="#CC3333">Hero bets $72</font>, BB calls $72.

River: ($240) 3[img]/images/graemlins/diamond.gif[/img] <font color="#0000FF">(2 players)</font>
BB checks, <font color="#CC3333">Hero bets $150</font>(i have ~$391 left after my bet)