Why are my images unclear on certain web pages?

[NikkiQ]

Why can I get perfectly clear images everywhere except on the pages like contact and about me .. pages that I have linked menu items to.

I get perfectly clear pictures everywhere else, on home page, carousel, slide show, collections etc.. but can’t on general pages  

please help! 

[Zworthkey]

@NikkiQ 
Please share your Store Url So i will check and fix it.

[NikkiQ]

www.artfromthebeach.com

thank you! 

[Zworthkey]

I Seem all images are ok.
provide me screenshot which picture is decay