Makeup trick: Where to Highlight

In terms of formulas and consistency, you can highlight with powder or cream, and it's not rocket science. Use a proper brush, like the Younique's Concealer Brush, which is perfect for both powder or cream consistency.
You can highlight with a concealer, with a lighter shade of foundation in cream or powder, and for the eyes you can also use a Mineral Pigment, like the Curious, from Younique.
Follow the above scheme and remember that the key is: blend!