Nut Flush Draw and Overcards

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i'm probably 3betting AQ preflop in the spot (I think this depends on the generaly game play of that limit and site ... which I don't know)

i'm probably raising the flop too ... but calling to build a larger pot isn't that bad either

on the river ... I think raising is a pretty bad move

there are two other guys calling down - you have the nut flush draw (that makes it unlikely that both of these guy also have the flush draw)
there are a couple of low straight draws on the board - but with two guys calling I would assume that at least one has hit the board (or has a smaller pp) and will call (after they call the turn)

so unless this guy is going to 3bet a worse hand you put yourself in a losing situation by not going for overcalls(especially since you'll likely call a 3bet, and lose)