如何在WordPress中显示高级自定义字段关系字段中的图像

Question

我有一个主要案例研究页面，我想在列表中显示每个案例研究中的类型页面的图像。我有以下代码：

    <div class="CaseStudyOverview" id="CaseStudyOverview">
<div class="CaseStudyOverview-Contents">
    <?php while ( have_posts() ) : the_post(); ?>
        <div class="CaseStudyPic-left">
            <div class="CaseStudyRightButton">
                <?php 

                    $photo = get_field('casestudy_image');
                    $pic   = get_field('casestudy_platform_image');

                ?>
                <img src="<?php echo $photo['url']; ?>" />

                    <a href="<?php the_field('case_studies_go_to_button_link'); ?>" class="make-Button--link"><?php the_field('case_studies_go_to_button');  ?></a>
            </div><!-- end of CaseStudyRightButton -->
            <div class="CaseStudyLeftPic">
                <img src="<?php echo $pic['url'];  ?>" />
            </div><!-- end of left-pic -->
        </div><!-- end of content-left -->

    <?php endwhile; ?>

</div><!-- end of CaseStudyOverview-Contents -->

有什么遗漏？