To change the margin on the left side of an element, we use the margin-left properties.

<head>
<style>

img {
margin-left:20px;
border:solid;
width: 100px;
height: 100px;
}
</style>
</head>
<body>
<h1>Travel Destinations</h1>
<img src="https://mimo.app/r/eiffel.png">
<img src="https://mimo.app/r/londoneye.png">
</body>
</html>]]>

Make sure to pick margin-left.