Hi Leon,

What if you do something like this:

@foreach(var item in selection){
    <li>
        <a href="@item.Url">
           @if (item.HasValue("mediaPickerAlias")){                                         
                var dynamicMediaItem = Umbraco.Media(item.mediaPickerAlias);
                <img src="@dynamicMediaItem.umbracoFile" alt="@dynamicMediaItem.Name"/>
            }     
        </a>

    </li>
}

And remember to chage this mediaPickerAlias so it match the alias of the media picker on the document type. Try also to see the documentation for the media picker here. http://our.umbraco.org/documentation/Using-Umbraco/Backoffice-Overview/Property-Editors/Built-in-Property-Editors/Media-Picker

Hope this helps,

/Dennis