<section class="destacada">
  <div class="contenido text-center">
    <h1 class="estilo"> Ayuda </h1>
    <img src=""/>

.destacada img{
  width: 50px;
  height: 50px;

 h1:hover ~ img{
  width: 200px; /*O lo que quieras*/
  height: 200px; /*O lo que quieras*/ 
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