What are you doing on your vacation? Taking great photos for our annual readers issue, we hope

If you’ve never submitted a photo for our annual “What I Did on My Summer Vacation” issue, we have only one question: Why not?

If you have an iPhone 8 or iPhone X, a Galaxy S8 or S9, you have a 12-megapixel camera with you. A Huawei P20 Pro? One of its three cameras is a 40MP model.

In terms of...