Reference:

https://speckyboy.com/20-free-web-mobile-wireframe-templates/

https://www.dreamstime.com/stock-illustration-flat-website-wireframe-different-variation-smooth-color-image70535398

https://www.sketchappsources.com/free-source/1836-single-web-page-wireframe-sketch-freebie-resource.html

https://colorlib.com/wp/free-web-page-wireframe-kits/