An experiment, I told 4o to turn an actual Ghibli image into a Ghibli image. Here is the original:
And here is the result of Draw this picture in the style of Studio Ghibli
It's quite fair to say that the AI did not improve on the original. For example, the picture lost fidelity: the lobster and the fish on the line became just a single fish.
It also interpreted Mei's leg as part of her arm, making her arm strangely thick in the AI image. It kinda got the fishing pole messed up too. There were other more neutral changes, like Satsuki's pose and expression, and the more washed out color tone.
At the start of the experiment, I half expected the AI to say, "This is already in the style of Studio Ghibli." It's safe to say that AI doesn't know when to say perfection.
Draw this picture in the style of Studio Ghibli