What are their pixel dimensions? That's the important part.
Some very important info here: https://www.damiensymonds.net/2015/08/about-jpeg-file-size.html
I've moved this thread into AD, since it's not a class question.
I can help you do anything you like with the background. You just tell me what you want.
You wouldn't have posted if you didn't already know I was right.
Sharpening exaggerates and enhances detail that is already there. It can't magically create detail that doesn't exist. Her lashes don't exist in this photo.