Great news, you can use images as options in a single or multiple choice field starting from Gold plan! All you have to do is add a Single or Multiple choice field to your form and then go to Edit choices.
For each choice you will have the option of uploading an image to be displayed as a choice. Only .png, .jpeg or .gif format are accepted, up to 1 MB per image. Once you have uploaded all the files, do not forget to save your changes.
Voila! You have now made a more interactive form as easy as 123!