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It's a bit dicey. You'd have to have a good reason for it. If Preston's POV is in the present, but Paola's POV is in the past, is the story happening in Preston's time? Is Paola relating things ...
#4: Attribution notice removed
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#3: Attribution notice added
Source: https://writers.stackexchange.com/a/41441 License name: CC BY-SA 3.0 License URL: https://creativecommons.org/licenses/by-sa/3.0/
#2: Initial revision
It's a bit dicey. You'd have to have a good reason for it. - If Preston's POV is in the present, but Paola's POV is in the past, is the story happening in Preston's time? Is Paola relating things in flashback? - Is Preston an alien or someone who experiences time in a non-linear fashion, as compared to Paola who is a more bog-standard human? - Are you experimenting with storytelling techniques? Shifting POV is fine; it's done all the time. Shifting tense usually indicates a break from the narrative. Dreams might be in present tense, for example, or a flashback from a present-tense story would be in past tense. But I think you would need a really compelling reason for Preston and Paola to have two different tenses in an otherwise straightforward narrative.