image size woocommerce product

Hello, thanks for this excellent theme.

I would like to know what possibility there is to be able to modify the size of the images in the products. In this product https://test.ombyjuliette.com/product/cojin-negro/ the images that I have uploaded have a measurement of 1600×1200 but when showing it its size is lower. I already use the plugin regenerate thumbnails however the size does not change, I made the modifications from the corresponding panel without achieving any change.
Could you help me to achieve a larger size of the images?
I would also like to be able to show the title of the product and be able to customize all the details. Is this possible?

The page I need help with: [log in to see the link]