Gathering book research

I have been looking for childrens book illustration to see what makes a still image so intense and scary for children. Also after studying the presentation, not only is the aspect of expressions,colour and the far of the unknown important - but also the idea that something doesnt belong, like this book for example:

Illustrations that were created with such a textured pencil also give the pages that extra fear factor, I think.

Seeing this book illustration made me remember a reoccuring dream I had as a child that stemmed from watching an episode about a train that left its tracks. I dont remember the cartoon, but ever since I've had dreams that everytime I stepped on the road,a black train would charge at me and it would terrify me. Growing up, even to this day I get anxious about trains. Im not sure where this fear stemmed from, but I think the idea of a train being somewhere, where it doesnt belong gives me the creeps.