What would be my best option to slim my jaw/chin and make my face less masculine? (photo)

Based on your photos, I would recommend a sliding genioplasty to make your chin more narrow, advance the chin to a more forward position, and lengthen your chin to diminish the deep mentolabial fold. This will make your lower face more balanced and feminine with one surgery. There is no implant and it is a natural way to achieve facial balance. The surgery is performed in the office with intravenous anesthesia and takes about one hour. Most patients are well recovered in one week.