The word posarás is the future form of posar in the second person singular. There are other translations for this conjugation.
See the full posar conjugation

posar

¿Recuerdas cuando ella te pidió que posaras para una de sus pinturas?
Remember the time she got you to pose for one of her paintings?
Me encantaría que posaras para mí.
I would love you to pose for me.
¿Posaras para la foto también?
Will you pose for the photo, too?
No puedo pagar mucho, pero me gustaría que posaras para mi.
I can't pay you much, but I'd like to have you pose for me.
Me gustaría que posaras para mí.
I'd like you to model for me.
Así podría pedirles permiso para que posaras para mí.
Then I can ask their permission for you to come and sit for me .
Tu posaras en este?
Are you doing this one?
Preferiría que posaras tú para mí.
I'd rather have you pose for me.
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