Hello,
1) Unfortunately, this default widget does not have more options. You can submit support request to WooComerce plugin author with your suggestion https://wordpress.org/support/plugin/woocommerce/ . We can do nothing with this because this widget is not theme custom widget.
2) Add the following code to Theme Options > Custom CSS to limit the images width
.content-product .product-content-image img {
width: auto;
max-width: 150px;
}
Provide screenshot of the share buttons issue for better understanding.
Regards