Call or fold?

Poker Room skin
Pot Limit Holdem Ring game
Blinds: $0.25/$0.25
8 players
Converter

Stack sizes:
UTG: $20.40
UTG+1: $23.25
MP1: $24
MP2: $19.20
CO: $24
Button: $6.05
SB: $25.45
Hero: $25.20

Pre-flop: (8 players) Hero is BB with
UTG folds, UTG+1 calls, MP1 folds, MP2 calls, 2 folds, SB checks, Hero checks.

Flop: ($1, 4 players)
SB checks, Hero bets $0.75, UTG+1 calls, 2 folds.

Turn: ($2.5, 2 players)
Hero bets $1.2, UTG+1 raises to $2.4, Hero calls.

River: ($7.3, 2 players)
Hero bets $2, UTG+1 raises to $13.3, Hero ???

Why did you bet $2 on the river?
If you bet to look weak and induce a bluff it is a call.
If you bet as a blocker figuring your oppoent won't raise unless you are beat it is a fold.

If you had no plan then the bet size is poor and I would either bet $5 or so or check-call.

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Yeah your bet sizing definitely needs a lot of work.

Flop bet is fine, turn bet should be around the $2 mark, maybe even slightly bigger.

River - as wota said

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Thanks a lot, guys, i'll have another look at my hands in PT, cause it seems that i often bet just for betting, with no purposes. What can you recommend me? May be concrete books or articles? Or just advice, that will be nice too.