Add the image via the media library and copy the image url into the src parameter of the img tag in an html field. Position the html field just below the checkbox field.

CF-add-image-next-to-checbox.css

/** All the sizes need to be adjusted to the webpage design and image size **/
/* Add the class image_checkbox to the checkbox field and the class image_display to the html field that contains the image */
.image_checkbox label,
.image_display img
 {
max-width: none;
}
.image_display {
position: absolute;
margin-top: -2.5rem;
margin-left: 1rem;
}
/*Add this class to the top fields of the row below the checkboxes*/
.next_field {
margin-top: 3rem
}

CF-add-image-next-to-checbox.html

<img src="http://my_domain/wp-content/uploads/2017/10/myimage.jpg" width="85" height="75">