Hello,
1) Here is the code if you want to increase the size of product title
.product-information .product_title {font-size: 26px;}
Use this code to reduce the size of the price and old price
.product-information .price, .product-info-wrapper .price, .product-summary-center .price {font-size: 18px;}
.product-information .price del .amount, .product-info-wrapper .price del .amount, .product-summary-center .price del .amount {font-size: 16px;}
2) I would recommend you to use all the images with identical proportions and width no less than 555px. At present your image is 200x150px. Image block is bigger – 262x196px and original image is resized, that’s why it is blurred. Read also WooCommerce recommendations about images size https://docs.woocommerce.com/document/using-the-appropriate-product-image-dimensions/
Regards