1. tears give way to smiles
e.g.: When the family knew he had regained consciousness, there was a sigh of relief and tears gave way to smile.
2. be all smiles
e.g. Radiant with smiles, he went from guest to guest, chatting and talking.
3. beam with smiles
e.g. He beamed with smiles when he saw his son had finally returned home, safe and sound..
4. (something unexpected, good news etc.) be overjoyed
e.g. When the tent opening was pushed aside they were overjoyed to see the South Peak of the Himalayas all radiant in white..
5. be subject to changing moods
e.g. Subject to changing moods, he is a rather unpredictable person.