By itself, I would consider Justice to mean that they see you as rational minded, fair, and detached, someone seeking for constant balance and generally achieving it. Fair-minded and merciful, but not emotional. Perhaps no-nonsense. Perhaps a bit too conditional in their affection, though the conditions would be reasonable and high-minded.
I'm not sure I'd see the 'openness' you mention. There are things the lady in Justice doesn't share. She is blindfolded, so we never see her eyes, which are a key pathway to revealing emotion and spirit. So, actually, I'd think she was good at hiding her emotions and spirit, almost the opposite of completely baring your true self. I don't think Justice is about effusiveness. I also think of her as 'Adjustment' (the Thoth designation) and it is a wave of infinite, constant adjustments that keep her in balance, and those are unseen. So, I personally don't think Justice shows us everything. She does know a great deal, and she metes out information as she sees fit to judge.