JSFiddle - React, Tailwind, and code Playground

HTML

<div class="myimage">
    <img src="http://images.google.com/intl/en_ALL/images/logos/images_logo_lg.gif" alt="img1" />
    <img src="http://maps.google.com/intl/en_us/images/logos/maps_logo.gif" alt="img2" />
</div>

<div class="movie-posture"></div>

JavaScript

$('.movie-posture').append('<img class="image  wp-post-image" src="' + $('.myimage img:first').attr("src") + '" alt="img3" />');