It's nothing like Ghibli, you are overthinking this.
You think that the model is not properly producing the style it was prompted for in the below prompt? I don't see other artists or styles mentioned.
> Make this a page in a colouring book. The drawing is in a simple Studio Ghibli portrait style. Bleed all the way to the edges. Background colour is #ffffff and lines are bold and #000000. There is no shading or crossthatching.