Hi McCloud, nice work on your portrait. Your image seems a bit too bright and your shadows too harsh. My suggestion would be to paint the face overall darker and save your whites for the brightest spots like maybe in the reflections in the eyes or on the tip of the nose. If you want to work in a high key where the skin seems really white try and make the shadows softer/brighter. The core shadow on your nose seems so dark compared to the core shadow on your cheek. Here is an image by Andrew Loomis as an example.
Notice how the values on the nose don't vary to much from the side of the face. It might help to work in graphite or charcoal if you want to work traditionally since it's easier to adjust values. Watercolor is really unforgiving.