No real read. River play standard?

PokerRoom No-Limit Hold'em, $1 BB (10 handed) Hand History Converter Tool from FlopTurnRiver.com (Format: FlopTurnRiver)

saw flop|saw showdown

MP2 ($8.00)
Hero ($98.50)
CO ($36.00)
Button ($76.50)
SB ($74.85)
BB ($100.00)
UTG ($47.00)
UTG+1 ($100.40)
UTG+2 ($89.25)
MP1 ($72.00)

Preflop: Hero is MP3 with 3, 3.
5 folds, Hero raises to $3.5, 2 folds, SB calls $3, BB calls $2.50.

Flop: ($10.50) A, 8, 4 (3 players)
SB checks, BB checks, Hero bets $7, SB calls $7, BB folds.

Turn: ($24.50) 7 (2 players)
SB checks, Hero checks.

River: ($24.50) 3 (2 players)
SB checks, Hero bets $15, SB raises to $30, Hero calls $15.

Final Pot: $84.50