JSFiddle - React, Tailwind, and code Playground

HTML

<a>
   <img src="https://cdn4.iconfinder.com/data/icons/imoticons/105/imoticon_15-128.png" /> 
   <img src="https://cdn4.iconfinder.com/data/icons/imoticons/105/imoticon_12-128.png" />
</a>

CSS

a img:last-child {
  display: none;  
}
a:hover img:last-child {
  display: block;  
}
a:hover img:first-child {
  display: none;  
}