I would say too, that if he nose bumps you or shoves his head under your hand, try a tiny forehead scratch with a finger to see how he responds. When a new bun comes up to me, I will usually slowly move my hand toward their head(from the side where they can see best), then let them smell my hand for a second. If they don't try and move away I will give a tiny forehead rub to see how they respond. If they move away or are busy exploring and investigating around me, I won't continue to try and pet them. But if they lay their head down or sit still there(which means they probably want head rubs), then I will gently continue the head rubs until they get back up and move away or start looking around again.
But if he does immediately hop away when you try moving your hand towards him, I would give it some more time before trying to reach towards him again, as it may be he's not quite ready yet.
But if he does immediately hop away when you try moving your hand towards him, I would give it some more time before trying to reach towards him again, as it may be he's not quite ready yet.