You used a computer to make a painting of your backyard to go along with a story you wrote. what type of artwork have you made

The computer art work in that is used to make a painting of your Back yard to go along with a story is called Illustration.

Explanation:

In illustration art work, the imagination has been painted on multiple frames or pictures, then to describe the imagination a story has been added with the images. Illustration is the art that is used to make images or paintings in the form of text, along with images. It is used to explain or write the details of the image or the story by adding multiple images along with the text.

So, The art work that have both image and story is called illustration.