After an application of concealer, foundation, and powder step back and observe what you have done. Do the products blend seamlessly and invisibly into the skin? Do you see any darkness or redness? Do not continue with any other makeup until the skin looks the best it can. If you need to improve how the skin looks, stop and look. Can it be corrected with a bronzing product? Or should you begin again using a different product?
Ashy
Warm up the powder color and/or add bronzer.
Is the skin oily? Did it change? Switch to paler powder and wait to check the results.
The skin is too dry.
Make sure you have enough moisturizer on the skin. It’s also possible to have too much. The foundation-to-moisturizer ratio may be giving the powder too much grab.