Capitalizing the I in Image helped a little. It brought a box with only the name of the post not the picture but it seem the box was the picture size. (this is without the html code)
I tried <img src="http://www.thirstyroot.com/blog/wp-content/uploads/2008/08/l_051-150x150.jpg" alt="" width="150" height="150" />
This did not do anything for either. it brought up the following:
&w=150&h=150&zc=1&q=100" alt="ACRONYM" class="left" width="150px" height="150px" />
sorry I thought this would be easier. I just really like thise theme but too much manipulation.