To embed images in a Google Earth placemark "balloon", you'll need to create a small amount of HTML code. To start, the image must be posted on the web. Then:
To simply embed an image: <img src="paste image URL here">
Float image to right (or left) of text:
<img src="paste image URL here" style="float:right; margin:10px;">
<a href="paste image URL here"
>xenter link name here</a><a href="http://www.uvm.edu">University of Vermont</a>
Create paragraphs:
<p>paragraph here</p>
Formatting basics:
<em>italic text here</em>
<strong>bold text here</strong><br>