Проверьте, пожалуйста, текст на британском языке и найдите ошибки, если они

Проверьте, пожалуйста, текст на британском языке и найдите оплошности, если они есть. Необыкновенно во временах.

This painting is called "Mona Lisa". The author of Leonardo da Vinci. Leonardo da Vinci drew a picture in 1503-1505. The painter uses shades of dark colors. The painting is believed to be a portrait of Lisa Gherardini, who was a spouse of a Florentine merchant.

In the background is a desolate land with a lake and snow-covered mountains are seen. In the foreground sits a beautiful young woman with dark wavy hair that fall on her shoulders. Lisa is sitting upright, half-turned, her hands folded on the armrest of the chair. She is wearing a deep-green dress. Her shoulders are covered with a shawl.

The picture of Leonardo da Vinci's "Mona Lisa" hangs in the Louvre in Paris. This is one of the most famous and expensive paintings in the world.