Norfolk Island Pines (Araucaria heterophylla) are notoriously finicky plants until they are well established and acclimated to their environment. If the light, water, soil and fertilizer are not just right, then the needled branches will turn dry and gray or brown. Cool temperatures and bright indirect light are best - close to a north or east window and away from heaters.
Water thoroughly and let the soil surface get dry before watering again. A porous, well-draining soil is essential. Dry needles mean that the roots are not getting enough water up to them. Underwatering is one obvious cause. However, root damage of any kind, including overwatering, can have the same effect.
NIP's do best in the same pot for a very long time, so avoid repotting unless absolutely necessary. You should consider moving yours back into its original pot.
Misting is fine, but not essential as long as the soil is kept properly moist.
Check regularly for spider mites. Look for new healthy growth on the top.
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Printer-friendly view of this garden