Examples of articles usage: Describing a picture to an/the other person

[Pedro8686]

Hello. Could someone explain if all the examples below could be correct in some sentences and, possibly, what circumstances would be needed to write each?

describing a picture to [] other person
describing a picture to [an] other person
describing a picture to [the] other person

describing a picture to nice person
describing a picture to [a] nice person

Thank you!

[Mister Micawber]

.
describing a picture to [] other person -- No. another person
describing a picture to [an] other person-- No. another person
describing a picture to [the] other person-- Yes. a previously-mentioned or specific other person

describing a picture to nice person-- No.
describing a picture to a nice person-- Yes
.
_________________
Native English teacher at Mister Micawber's

[Pedro8686]

Thank you for making it clear :)