“容光焕发”常见的英文表达有 “be radiant with joy/health”、“look fresh and glowing” 或 “have a glowing complexion” 等，具体可根据语境选用：
1、 be radiant with joy/health
强调因喜悦或健康而散发的光彩，例如：
She was radiant with joy after hearing the good news. （听到好消息后，她容光焕发。）
2、 look fresh and glowing
侧重于形容外表清新、有光泽，例如：
After a good night's sleep, she looked fresh and glowing. （睡了一夜好觉后，她容光焕发。）
3、 have a glowing complexion
强调皮肤红润有光泽，例如：
Regular exercise helps her maintain a glowing complexion. （经常锻炼让她容光焕发。）
根据具体语境选择最贴切的表述即可。