Well first of all, I will comment that you did get healthy fish if they came from Hans.
They appear to be at the 3" to 3.5" mark showing that the PB is not fully colored up. Being a newbie with Discus can sometimes get discouraging because of the steady water changes and multiple feedings. All that hard work pays off 100 times over in the end.
I do see some peppering in the PB but that possibly developed because of all the decor in tank. All look wonderful and are still young. keep up on the maintenance and you will have good results.
It would have been much easier for a newbie if fish were in a bare bottom tank.
...Ralph