Attaching files to tasks is not yet available in GQueues, though it is on the roadmap and will be developed in the coming months. However, there is a simple trick for including images with tasks which you can use right now. When typing the notes for a task, paste in the URL to an image already on the web. This could be a publicly available image or even one stored in your Google Drive.
When you click out of the notes, a thumbnail will be appear for easy reference. Clicking the thumbnail will display the full size image at its original location.
Note: The image URL must end with one of the following extensions: .jpg .jpeg .png .gif .bmp .webp