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I put an asterisk behind the LT symbol to break the code.
Take the asterisk out gives you the image directly below.
<*img src="http://www.greatideasshow.com/wp-content/uploads/cropped-FINAL.jpg" width="100" />
<*img src="http://www.greatideasshow.com/wp-content/uploads/cropped-FINAL.jpg" width="200" />
Here I added the "height" tag. You may find some images that you want to altar the width to height ratio (aspect ratio).
<*img src="http://www.greatideasshow.com/wp-content/uploads/cropped-FINAL.jpg" width="100" height="300" />
You can also use % of display ie width="50%"
Keep in mind the size screen your viewer may be using, and if there is text within the picture you may need to adjust size so that the text is readable.
Very basic info, but you'll catch on through trial & error.