Self Portrait Half-Way There

I'm still working and have painted a good part of the opaque oil painting. I would like to work alot more on this though, especially on the eyes and hair and skin tones. I have found it difficult to make the paint bright enough on the area of the light source, especially in my hair. I don't know how to do that or how to make it clear that there is clay in my hair. I really need to play with texture and light and make sure I stay true to the colors and skin tones. Feed-back would be nice. Thanks