How to Display a Logo Image on a Public Form?

I would like to display a logo image in the header of a form. To achieve this, I added an Add Notes field to the form.

The code below works perfectly for Zoho users accessing the form. However, when the form is made public, the image does not load properly:

logo = Images[ID == 214225000000246016].Image;

logo = logo.replaceall("/sharedBy/appLinkName", zoho.appuri);

logo = logo.replaceall("viewLinkName", "All_Images");

logo = logo.replaceAll("fieldname", "Image");

logo = logo.replaceAll("<img", "<img height=100px width=200px");

input.plain = logo;

I have also made the All_Images report public.

What am I missing here?