How can I improve the quality sharpness of my images online?

Site URL: https://bluebird-porcupine-yzdg.squarespace.com/shop/p/block-hoodie-3ypjb-x9dtm

Hello, I was wondering if someone can give me some advice on uploading the best possible image quality so my images look a sharper online?

Currently, my images don't look as sharp especially when zoomed in see here: https://bluebird-porcupine-yzdg.squarespace.com/shop/p/block-hoodie-3ypjb-x9dtm

Compared to another fashion site these images zoomed in look better, see here: https://www.zara.com/uk/en/puffer-gilet-with-pockets-p03918311.html?v1=59674131&v2=1640230

I am currently processing my images in Photoshop with the current settings:

• Image format = .png
• Image size = 2500 by 3749 px
• Color mode = RGB Color

Is there anything else I can do to improve the quality and sharpness of my images (especially at zoom)?

URL Page = https://bluebird-porcupine-yzdg.squarespace.com/shop/p/block-hoodie-3ypjb-x9dtm

Pword = bluebird

Many thanks,

Best,

Faiz