Someone who saw the Prophet ﷺ at Ahjar al-Zayt told me that he was supplicating like this, and he gestured with the inner sides of his palms facing his face.
حدثنا يزيد حدثنا شعبة بن الحجاج عن عبد ربه بن سعيد
حدثني من رأى النبي ﷺ عند أحجار الزيت يدعو هكذا وأشار بباطن كفيه نحو وجهه