Hello,
First of all, Customize > Woocommerce > Product Catalog > Products per row.
We would recommend to use graphics editor and prepare product images (make them the same size) before uploading it to your media gallery, then your grid will look much better.
For now, try to add this custom css code in Theme Options > Styling > Custom css:
.content-product .product-content-image {
min-width: 1px;
width: auto;
max-height: 195px;
}
.content-product .product-title {
min-height: 70px;
line-height: 1.3rem;
}
Let me know result.
Regards