Asalamu alaikom
I have a book that contains a picture of the prophet peace be upon him. What should i do with it ?

All perfect praise be to Allah, The Lord of the Worlds. I testify that there is none worthy of worship except Allah, and that Muhammad is His slave and Messenger.

No real picture of the Prophet has ever existed. The picture you mentioned is just an imaginary suggested depiction, not a real one. However, you can remove that picture (cover it or erase it) and benefit from the rest of the book if it is useful.

Allah Knows best.