Prompt: Write a short story about a man who discovers a magical portal

Tom had always been fascinated by the tales of magic and adventure, so when he found a portal hidden behind a forgotten painting, he knew he had to explore it. As he stepped through, he found himself in a new and mysterious world. He quickly discovered that this world was home to beasts and beings that he had never seen before, but he was not afraid. He was determined to find out more about this magical place and the power that lay within it.