Did I play this right?

[Baby Mantis]

Did I play this right, is it correct to raise with middle pair?
PokerStars Game #12046857325: Hold'em Limit ($1/$2) - 2007/09/14 - 00:55:02 (ET)Table 'Forsytia' 6-max
Seat #3 is the button
Seat 2: ($18 in chips)
Seat 3: ($79.75 in chips)
Seat 5: ($64 in chips)
Seat 6: Hero($50.25 in chips)
: is sitting out
villian: posts small blind $0.50
Hero: posts big blind $1
*** HOLE CARDS ***Dealt to Hero[8s 6c]
seat2: folds
seat3: calls
villian: calls $0.50
hero: checks
*** FLOP *** [8d Jh 5h]
villian: bets $1
hero: raises $1 to $2
seat3: folds
villian: calls $1
*** TURN *** [8d Jh 5h] [6s]
villian: bets $2
hero: raises $2 to $4
villian: calls $2
*** RIVER *** [8d Jh 5h 6s] [6d]
villian: bets $2
hero: raises $2 to $4
villian: calls $2