Makeup/Hair trial question?

Stupid question...but.....

Do you tip the makeup artist/ hair person for your trial????
And what do you tip??

Thanks

I did. I've been to two trials at two different places so far and I've tipped both the hair and the makeup person at each place.
The last place I went to the owner did both my hair and makeup, and I still tipped even though people say you don't have to tip the owners.