Can I ask a question in a form where you can download a picture as an answer?

Are you planning to allow your users to upload an image from your form? If yes, then please use the File Upload field. Here's a guide: How-to-Create-File-Upload-Forms.

If you are referring to insert a downloadable link to the form, then please check this guide: How-to-Add-a-Downloadable-File-to-Your-Form.

You may also use these widgets:

Image Choices

Image Picker

Image Checkboxes

Image Radio Buttons

Here's a guide on How-to-Add-a-Widget-to-Your-Form.

Hope that helps. Thank you.