Leave room around your head: the bottom of the photo should be at your shoulders, and you can crop it when you upload.
Don't text the photo to yourself: messaging apps lower its quality.
An employee reviews the photo again after you submit; if it fails, they will ask you for a new one.
How to do it with Requisito Listo
Open the «Photo for online passport renewal» template in the app.
Take the photo with the on-screen guide (or pick one from your gallery).
The app centers your face, makes the background white and gets the exact size and file weight.
Check the checklist, then upload or save it.
At the end you'll see a checklist: size, file weight, background and format. If something doesn't comply, it tells you what to fix before the portal rejects it.