Hi,
Don't worry, he seems pretty active and alert from the photos. Usually, when they are in shedding phases, they may or may not be interested in food. Some beardies will be extra hungry while others may not care for it. It is really itchy for them so they tend to be in grumpier moods. If he has not eaten for a week or two, then I would be concerned but if he is shedding its normal behavior for them to go off food and or not interested.