Your values are visible in your behavior. In the words you speak and how you carry yourself.
Instead of trying to choreograph your appearance, focus inward. Start with your identity. Once you work on those internal drivers, you can let go of pretension, and act in alignment of who you are.
You no longer need to act confident, you are confident.
You no longer need to act composed, you are calm, composed, and collected, stemming from that quiet confidence you've built within.
You no longer need to act like a kind, compassionate person, you are that person, having cultivated love and empathy in your heart.
Focus inward. The outward appearance follows.