I have used methods described above. Now I am using the method which is a way similiar but more simple to me.
Like this:
<img src="icon.jpg" width="324" height="324">
<p align="center">
<img src="screen1.png" width="256" height="455">
<img src="screen2.png" width="256" height="455">
<img src="screen3.png" width="256" height="455">
</p>
On above example I have used paragraph to align images side by side. If you are going to use single image just use the code as below
<img src="icon.jpg" width="324" height="324">
Have a nice day!