If you think these incredible images are photos, think again. They are in fact probably the world's most intricate doodles.
It may be hard to hard to believe but the pictures below are created using standard ballpoint pens bought from places like Staples, eBay, Amazon and, the artist says, any good office supply store.
They're drawn by Portugal-based attorney Samuel Silva, who describes his art as a hobby. However, this is no ordinary hobby - sometimes he works on a piece for up to 50 hours.
Like a photo: Portugal-based attorney Samuel Silva, 29, describes his art as a hobby
Speaking about his picture of a Sumatran tiger, which took around 20 hours to finish, Silva said: 'This one is wild, that's why I love it.'
After finishing this work, Silva said: 'Eight hours to finish. Just another quick doodle. Or call it a study or sketch. My first eagle head ever.'
On this piece, Silva said: 'Originally I intended to spend 100 hours with this, and still I never spent so many hours with any drawing, in the end impatience won and I'll not work on this one anymore.'
Silva said the original size of this drawing of a cat's face is about the same as two credit cards
The painting Girl with a Pearl Earring is one of Dutch painter Johannes Vermeer's masterworks, but Silva copied it using ballpoint
This was Silva's first ever picture of a jaguar. It took him 15 hours to complete