live 1-1 NL game

[chisness]

i very rarely play live and i very rarely play NL cash games -- this was a live 8 handed game at my house

UTG opens for 6, folded to me in BB with AQo, i call

UTG has tight opening standards but would also certainly make a smaller raise with a very premium hand

flop A57, i check, he bets 5, i make it 15, he calls

turn A, i bet 20, he calls

river 6, i bet 40, he debates and mucks AJ face up

my image was pretty tight and i think he had me on a set -- was my river bet too big, do i use this type of river bet to set up big bluffs in future, is betting small or even checking this river hoping to get raised good?