For the image at a new table...
If you sit down at a new table and nobody knows you, it's worth it to make some small bluffs that don't damage the BR. Say some connectors hit on the flop.
You proceed to make a medium bet, show confidence. The other players will pick up that you are not a passive player, they will back-down, most likely, in the future.
For a small investment, you have gained the table image as an aggressive player.