blurry images once I upload them on wp

Hello
it’s been more than one month since i’m trying to find a solution for the blurry images problem and still didn’t find any.
I take pictures with my dslr camer and I copy them on my computer I resize them (they still a bit large to avoid pixelelization ) and i save them on the web with 72 dpi .
they looks crispy and clear and even on the edit post they looks perfect but once I upload them it turns blurry and not really high quality
I downloaded some plugins maybe it could work and nothing’s work
I try to verify the default zoom level of my browser (google chrome) but still doesn’t work
is there any solution?
you can check it on my website
https://www.penandruler.com/?p=572

and on flickr (you can see that this one is more crispy and clear )