How can I lengthen product images and adjust text margins?

[nerveconcepts]

How can I make the image a little longer and the text has those margins as shown in the image?

the page is: https://nerve-concepts.com/

[nerveconcepts]

What would be the ideal measurements for what I am looking for?

[nerveconcepts]

the size of the original image is 2880x3500, it is supposed to be longer but when it is set it is adjusted and still looks the same.