Hey,
You probably already got it fixed as I can see that images are resized than the original theme demo.
Anyhow, there are couple of ways to achieve this. Most efficient way would be using CSS classes.
CSS image for Latest Post is “.powen-featured-img img”.
What you have to do it is installing a plugin “Simpe Custom CSS” and add a new line of CSS code as follow :
.powen-featured-img img {
height: auto !important;
width: 200px !important;
}
You can just edit the value of width to the extent (low or high) when you feel the image size is right for you.
Why installing a plugin for this? If you want to keep your latest post image same even after the theme update, you have to keep it in a different stylesheet than the theme owns style sheet and this plugin helps you to achieve.
Hope this helps ??