Probably the main difference of playing live (ignoring tells
etc) is the pace of the game. Online you can see up to 8 times as many hands per hour, so you "big" hands happens more often. Live play takes a lot more patience, and in essence mistakes are much more costly, especially if its a tournament. There may not be another game a click away.
Betting for value, spotting the donks early and realising when your beat early is all easier live, so is bluffing against the right player. The only advise i can give you really is to loosen up slightly (slightly) make the realisation that sometimes the chances you take can bust you early, and try to pick up on some of the betting patterns of the opposition.
Oh remember, dont watch the flop, watch the players watch the flop.