Originally Posted by MalloyMartini

if the model is doing her own makeup, then she might have a base or power that's made of minerals or have a high SPF... both are designed to reflect sunlight, and generally will reflect studio lights as well, giving off the "shiny" look.... although, if you're using a MUA then that shouldn't be the issue unless she's using airbrush makeup, because some brands of airbrush makeup base tend to melt under hot studio lights easier then others.... which would make her shiny.... or something else already suggested!! lol .... :D