Use the adjective rosy to describe something that's healthy and pink, like a child's rosy cheeks or a rosy lipstick.
A flushed face is rosy — it's the glowing pink color of a natural blush, and it implies good health. From this meaning comes the secondary one, "optimistic or lucky." If the future looks rosy to you, it appears that great things are going to happen, and if someone has a rosy nature, they're cheerful. Rosy is from rose and its Latin root, rosa.