The issue at hand is the absence of a sibling element next to the IMG tag that can be selected.
Here is the current structure:
<div class="span12 dark">
<a href="http://whatever.org">
<img src="http://lorempixel.com/400/200">
</a>
<p class="description">I re-designed Trulia's iPhone and iPad experiences, surfacing local data and heatmaps, while improving the core search experience. The project was also an opportunity to define a new visual language for all of Trulia.</p>
</div>
What you should have instead is:
<div class="span12 dark">
<a href="http://whatever.org">
<img src="http://lorempixel.com/400/200">
<p class="description">I re-designed Trulia's iPhone and iPad experiences, surfacing local data and heatmaps, while improving the core search experience. The project was also an opportunity to define a new visual language for all of Trulia.</p>
</a>
</div>