Baby flush on turn - but is it good?

Fourth hand of new session. Villian is unknown and I decided to start off playing a bit LAGish.

Party Poker No-Limit Hold'em, $ BB (6 max, 5 handed) internettexasholdem.com

SB ($114.25)
BB ($48.15)
UTG ($50)
MP ($70)
Hero ($49)

Preflop: Hero is Button with 4[img]/images/graemlins/spade.gif[/img], 7[img]/images/graemlins/spade.gif[/img]. SB posts a blind of $0.25. UTG posts a blind of $0.50.
UTG (poster) checks, <font color="#666666">1 fold</font>, Hero calls $0.50, <font color="#666666">1 fold</font>, BB checks.

Flop: ($1.75) Q[img]/images/graemlins/spade.gif[/img], 6[img]/images/graemlins/spade.gif[/img], T[img]/images/graemlins/diamond.gif[/img] <font color="#0000FF">(3 players)</font>
BB checks, <font color="#CC3333">UTG bets $2</font>, Hero calls $2, BB folds.

Turn: ($5.75) A[img]/images/graemlins/spade.gif[/img] <font color="#0000FF">(2 players)</font>
<font color="#CC3333">UTG bets $5</font>, <font color="#CC3333">Hero raises to $15</font>, UTG calls $10.

River: ($35.75) J[img]/images/graemlins/club.gif[/img] <font color="#0000FF">(2 players)</font>
UTG calls $32.50 (All-In), Hero calls $31.50 (All-In).

Final Pot: $99.75

2:1 odds here - what are other likely villian holdings besides highrer flush (which seems to be most likely holding as he is WILLINING puts in his whole stack on river with 3 [img]/images/graemlins/spade.gif[/img]s on board OOP. (but hey this is SSNL so you never know)