From that photo, he looks very well-fed. I wouldn't feed him 2 lg. adult mice at this time. Don't know what interval you're feeding at, but if he's really "starving" you
could always move up the next feed by a day. Better to grow snakes a little slower...over-feeding is as bad for them as it is for us. (see 'fatty liver disease' or 'hepatic
lipidosis')