You can see by the veins that peek through on my hand that despite layering, the colors don't morph into war paint and become opaque. I had an easy time blending the colors on my hand, so one can only assume it'll be the same on your face.
Tip: to maintain an even blush/bronzer application, make sure you moisturize your skin and then provide a primer/foundation layer for it to go on top of. The moisturizer will keep your skin moist and prevent drying-cracking mishaps, and the primer (or foundation) will create an even barrier between the powder and your skin, preventing blotchiness and allowing for a smooth blending process.
Have you found any drugstore gems recently?