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This may be caused by your code, for example a @media query for responsive layout and 100% width on images making smaller images look granular when blown up full-width on a smartphone screen.
It could even be other reasons, do you have a code dump, example image and screenshot to detail it better?
Thanks for your quick reply! I've originally saved the image file at W: 700px and H: 500px which is the size of my container for my email.
After changing the size of my image file for about 3 times larger (2100px by 1500px) and then shrink the image down to 700px by 500px inside the email editor, I was able to get a really clear photo!
I'm not sure why this way worked out but oh wells~