Hi…Talaria…:applause: 
Nice job,…now you are getting the hang of it…
Take a close look at the way the old masters did the high lights in the eyes,lips, nose ect.
Most of the time, the high light that is in the eye that is in shadow, will be a tad darker.
Also the lips have distinct planes, which all capture the light and shadows, the same as the nose planes…the line in the center of the lips, becomes an edge, that varies, and vanishes into the shadow of the shadow planes of the lips, and also emerges into the light. The top lip will appear a little harder,in the way it reacts to the light,… while the bottom lip will appear soft, in the way it reacts to the light.
I think that as long as you keep in mind while you are painting, that the forms of the face, and body, are made up of many many planes, that are devided up into many even smaller planes, and that each plane is capturing the light, and also creating a shadow at the same time, then you will be on the right path to great painting.
When you use color, the same princaple will apply, except you will be varying the shade of the color from dark to light on each planed surface.
Also study the size and shapes of the high lights of the eyes in the portraits done by the old masters.
In most cases, you want to really snap or pop them in there really quick, with a tiny pointed brush…gives them energy and life…takes a lot of practice, and is an art in itself.
These little subtle things are what counts when doing portraits, and the whole figure for that matter…Each master handled them in there own way, but the princaples remain the same…
Hope these words help a little,…think you are doing a fantastic job by the way…really great progress…and a real pleasure seeing it…

TAKE CARE
Glenn