I would charge what people in your area would for headshot makeup or model portfolio makeup. It's usually around $100-$150 for either with 1-3 changes to makeup/hair. This is per person. I wouldn't charge by the hour for these types of shoots.

Usually I would ask how long the shoot is so if they run over what you intend to charge them, they know there is over time at $50/hr or something like that.

Sorry I can't be more specific, it really depends on your area and I'm in Canada, so... :)

Tasleema

Makeup & Hair
Toronto, Canada
www.tasleemanigh.com