"The process is simple," explains David DeVries when talking about his website that turns children's drawings into works of art.
"I project a child's drawing with an opaque projector, faithfully tracing each line. Applying a combination of logic and instinct, I then paint the image as realistically as I can."
The Monster Engine has become something of an online phenomenon since it started 8 years ago, when it claims to have picked up 17 million hits within one month - all through word of mouth.
The inspiration came to DeVries one day while flicking through some doodles drawn by his young niece. Inspired by his lifelong love of comic books, he set about turning them into fully-fleshed images.
"My medium is mixed - primarily acrylic, airbrush, and coloured pencil," the 45-year-old explains.
It's easy to see the appeal in The Monster Engine. Children's drawings have long been held up by adoring parents as fascinating insights into their imagination and blossoming personalities. DeVries manages to be faithful to their vision, but turns it into something that will in turn inspire youngsters by saying 'look what you can do if you keep practicing'.
We've gathered ten of our favourite images from The Monster Engine below, but to learn more, visit the official website.