[Users] Face without Face:...?

[Pierre Fortin]

I thought Face: (or X-Face:) were the only pieces used to display a face
in the upper right of the message pane...

However, got an email with what appeared to be a really good quality
image; so being curious about it, looked at the message's source...

Surprise!  No [X-]Face: header...

The "face" I'm seeing comes from the HTML part which contains: 

    <a class="aw-image-link"
    href="http://clicks.aweber.com/y/ct/?l=IHQy.&m=40lCf7DTaQaJr48&b=O7z5DlR8JAXZjdFBAaTmDA"> 
        <img align="left" class="model" border="0"
    aw-attributes="src,alt,width,height" style="margin: auto; width:
    81px; height: 107px; "
    src="http://createlastwill.com/wp-content/uploads/2011/10/howard.jpg"
    alt="Howard Deutch" width="81" height="107"> </a>


The .jpg is where the face... er... image is coming from...

If I switch to the text/html part, the face is inline with the text; but
in the message/rfc822 part it appears as a Face... 

Gotta figure this is intentionally coded; but never noticed it before...

So...  how does one use this form...?

Pierre