What kind of images (other than photos taken on iPhone), can get the depth effect on iOS16?

What should be modified or added to a photo like this:

So it could have the depth effect that photos taken on iPhone have, like this.

Strangly, even though the image of the fish is not appropriate for depth effect, the subject can be easily extracted with a long press, like it is described

CodePudding user response：

As far as I can tell, if you can extract the subject, you can use it for depth on the lockscreen. I've noticed that it will only cover up a small percentage of the time (e.g. just the bottom of the numbers in 10:41) before disabling depth effect for a photo. Try zooming and panning the fish so that it just barely covers the time. I don't think it will let the subject cover the complete height of the time.