Agree. I've made it a habit the past few years to include before/after screenshots in my PRs and sometimes a screen capture of the UI/workflow changes. Also, screenshots in the issues pages for bugs or anything UI related.

I find it makes it easier for people to see and understand the goal of your changes and helps them focus on the how in the code review.

When others do that in their PRs I can jump straight into the tests files and get a better understanding of the what is proposed (or at least start the review process in a more substantial way - get the important stuff addressed early on).