Pictures too big.

The slider by default takes the thumbnail version of the featured image.

If you would like to give it a specific width or height, please uncomment the width and height of the following class on assets/css/custom-styles.css file accordingly.

/****************  Slider product image ****************/
.wa_wps_image_carousel img {
	border: 1px solid #ccc;
	background-color: white;
	padding: 9px;
	margin:5px 0 5px 0;"
	display: block;
	float: left;
	height: 100px;
	width: 100px;
}

I hope this helps.
Thank you.