Render Image on Controller
You can add the element using the image theme hook:

$page['element_three'] = [
  '#theme' =&gt; 'image',
  '#uri' =&gt; $image_path,
  '#alt' =&gt; $title,
  '#title' =&gt; $title,
  '#width' =&gt; $width,
  '#height' =&gt; $height,
];