Why become my product photos blurry once i upload them?

[Melizafashion]

Hi,

Look at these two links:

Good/ Big:
https://melizafashion.com/collections/sale/products/sequin-one-shoulder-tulip-hem-bodycon-dress?vari...

Small/ alot of pixels
https://melizafashion.com/collections/sale/products/slit-square-neck-wide-strap-dress?variant=477310...

What is causing this pictures to be smaller then before? Also is there a way to enlarge all these pictures so the quality increases?

Thankyou,

Björn

[Jason]

Looking at that link it really seems like the image was already that way before uploading. When looking at the image the hair doesn't look like the result or normal compression that I would expect. Do you still have the original image that you can double-check that the problem isn't in their first? If it looks perfect (and large) consider uploading that somewhere so we can see it too. 

The other image is better, but it too looks like it was heavily compressed before uploading.