Taking Marketing Pictures while unit is occupied by a tenant

[Gabe N.]

I have a single family home that i have been renting to the same family for 7 years. 
During their tendency, I have made a lot of upgrades in the house.  I would like to take some pictures of the house right now
for marketing the property after they leave. The tenant gave me verbal permission and written permissions through a text message that they are fine with me taking and using these pictures of the house for marketing reasons. I am not sure if i am being too paranoid but Should i get them to sign some document indicating that they don't have any rights to these pictures and the landlord is the owner of the pics?

If so, does' anyone have any doc like this that you can give me?