I've queried with Schleich how the 2005 smurfs were painted and here is what they said: -
They are all hand painted, but the technique varies, some are hand dipped in paint and finished off with a brush whereas other painters paint everything with a brush, so it depends on the painter.
I queried whether the method of painting had changed because some of the 2005 smurfs had problem areas as far as I was concerned, so that was the response.