NL50: TPMK meets a donk's river c/r

[guess who]

Hello,

currently I'm back to NL50 and this hand came up during my todays session.
villian is quite a donk with datamined 58/18/1.8 (153 hands). I'm new at the table and have been quite carddead, I ran at 2/2/0 over my first 30 hands.

Party Poker
No Limit Holdem Ring game
Blinds: $0.25/$0.50
6 players
Converter

Stack sizes:
UTG: $58.42
UTG+1: $45.12
CO: $53
Hero: $53.43
SB: $81.93
BB: $50

Pre-flop: (6 players) Hero is Button with A[img]/images/graemlins/spade.gif[/img] T[img]/images/graemlins/spade.gif[/img]
UTG calls, UTG+1 calls, CO calls, <font color="#cc0000">Hero raises to $3.5</font>, 2 folds, UTG calls, 2 folds.

Flop: 7[img]/images/graemlins/diamond.gif[/img] 4[img]/images/graemlins/spade.gif[/img] A[img]/images/graemlins/club.gif[/img] ($8.75, 2 players)
UTG checks, Hero checks.

Turn: 4[img]/images/graemlins/heart.gif[/img] ($8.75, 2 players)
<font color="#cc0000">UTG bets $1</font>, <font color="#cc0000">Hero raises to $6</font>, UTG calls.

River: Q[img]/images/graemlins/diamond.gif[/img] ($20.75, 2 players)
UTG checks, <font color="#cc0000">Hero bets $8</font>, <font color="#cc0000">UTG raises to $24</font>, ...


Flop: I tried a little pot control here, since no draws are possible and the pot being already quite big.

Turn: $1 bet screams a lower pair so I raise it up a bit.

River: value bet ftw...

His big river raise really scared me... I tend to put him on a 4 and think about folding.

Is my ace any good here?

ty for your thoughts,
guess