however, the first image stands out from the pictures of the other products and doesn’t look professional.
Sorry, I do not understand this reply.
Please provide screenshot with annotation to describe this issue.
By the way, your issue could be due to changes you made in woocommerce product image setting.
You could have unchecked the Hard Crop image setting, which is why your images are not of same size.
You should use the following plugin to regenerate your images.