First, tint the inside of the ball with metallic acrylic paint:
1) tint the edges of the ball (part 1) with gold color - stronger at the edges, but closer to the center, with an almost dry sponge, thus creating a "mist".
2) when the gold paint has dried, then paint the entire inside of the ball in a pink mother-of-pearl tone - when viewed from the outside, the golden "smoke" will be visible.