Advice from makeup artists

[SIZE=12pt]I have a question for make up artists. I am a makeup artist working a gig with a photographer for a shoot that’s going to be doing 20 min headshots all day long. I think we have 10 people signed up for one day so far starting at 11am. I’m currently negotiating my fee and am asking $50 a person/ headshot for the day.  I don’t want to underrate myself ( I usually charge a flat fee for one 2-3 hour headshot session) , but I feel this fee is fair given it’s my makeup supplies, time and artistry, and I will be there all day. [/SIZE]

[SIZE=12pt] Any thoughts or feedback about this and if you’ve had similar jobs that designated a specific fee given the high volume of faces I’ll be doing for this shoot.[/SIZE]