Murata's dimples are quite different from Maeda's. The latter's have hers nearer to the cheeks and the dents are spread out over a bigger area, whereas Murata's appear as distinct, deeper dents nearer to the edge of the mouth. Although the English Language doesn't have different vocabulary to distinguish the 2, there are 2 separate words to differentiate dimples like Murata's and Maeda's in Chinese. I believe dimples like Murata's are a rarer sight compared to Maeda's. No offence intended, just an opinion.
nice comparison of dimples hehe, anyway... @topic, I really loved Megumi's smile since I first saw Melon. I didn't know she was the previous leader of the group... and, I loved her glasses