Need Help with Responsive Design

Here is the website I’m working on:

How would I make it so (1) the header / nav bar and (2) the Image is responsive on both smaller and larger screens. Right now it only looks good on a 15" screen. If I make the screen larger or smaller the image and navbar distort.


I think you just need to experiment with more media queries.
I added one here at about 1000px: