.author-fd img{
padding: 0;
float: left;
border: none;
margin: 0 10px 10px 0;

<b:includable id='post' var='post'>
<div class='post hentry uncustomized-post-template'>
<a expr:name='data:post.id'/>
<b:if cond='data:post.title'>
<h3 class='post-title entry-title'>
<b:if cond='data:post.link'>
<a expr:href='data:post.link'><data:post.title/></a>
<b:else/>
<b:if cond='data:post.url'>
<a expr:href='data:post.url'><data:post.title/></a>
<b:else/>
<data:post.title/>
</b:if>
</b:if>
</h3>
</b:if>

<b:if cond='data:post.author == "AUTHOR1"'>
<span class="author"><img src="IMAGE1_URL"/></span>
</b:if>

<b:if cond='data:post.author == "AUTHOR2"'>
<span class="author"><img src="IMAGE2_URL"/></span>
</b:if>