How to spot if someone on twitter is fake?

[Ayu]

is there any ways to know if someone's using other's photos on twitter?

[<3]

Yes,
Check the profile: is it informative enough and describes the personality or profession of the person?
Check the avatars and photographs: Avoid the bikini clad girls like the plague. Does the image gallery on Twitter give you any clues?
Check the conversations: Does the shared updates match the tone and context of a genuine account? Are the message updates overtly aggressive?
Check the follower and following: A fake account (or at least a not-so-useful one) will have a disproportionate follower and following count. A real account will have a more balanced ratio.
Check inactive accounts: These are accounts which are just inactive, but not fake. You can choose to block and bulk unfollow these accounts as they do not contribute to engagement