Thank you for the tip, I have to buy that asap. Unfortunately I didn’t know Dave Mc Kean but I like it a lot as well.
I don’t think kids would be naturally afraid of it, depending on the age of course. My son was scared the most of the movie ET. It was such a surprise, but after watching the intro, the boy walking to the garden finding ET he totally panicked. It was almost PTSD like and connected to a lot of hiding in the Oshi-ire for some weeks 
Usually they don’t like the things I choose anyway, so I might buy it for myself.
Another try to give you an idea on how it works:
I enter “/imagine” then your text “Dave McKean, held hostage and churning out art as fast as he can. He blinks three times if he needs help.”
Here it would be possible to add some additional things, like seeds etc, but not a lot.
The result comes in 4 small image proposals:
Here you can do the following:
Enlarge on of these (with more details) or create another four variations of on of these.
Please choose what you want to do! (I will do according to your choices)
The reason why I post this is to show, that even if it is generated by an AI it is still the work of a human “artist” to a certain degree. You have to test with the input sentence and the image selection to get a result.
Not saying that it is comparable to an artist before AI, it is definitely easier to get results, but I think it is necessary to never forget, that an AI just cannot do certain things per definition.
That’s my personal view of the AI topic, feel free to condemn me