I love the way makeup responds and changes with heat and body temperature.
The way a cream product softens between your fingers and melts into skin is one of my favorite things. When you're shooting on a hot day, there is a magical moment right before the model finally breaks a sweat when the moisture is all just below the surface and the skin glows in an unduplicatable way.
A mentor of mine once told me, "don't do makeup for how it looks right now, do it for how it will look in 45 minutes." He's the same mentor that taught me how to use cream products as tools and bases, different ways to apply them using fingers and brushes. So many different techniques that create subtle effects, so much so that you probably wouldn't even notice it had been done, unless it actually hadn't and the picture was left lacking.
Carving out contours, pressing in highlights, creating a flush from within look on the cheek, staining a lip or smudging an eye. Using your hands as tools, softening the product with the heat of your fingers, cutting and mixing textures. These are some of the things I love about cream and oil based products, and how they can be warmed and manipulated on the skin, only to have them change even more as the time passes. "Just wait until it all settles in" is a phrase I've said more than once. And though a cream can be set with a powder or a spray for holding power, there is also something wonderful about letting it go and seeing where it ends up.