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Thank you for your comment and also for advise, you are right I need to see how I could add shadings I just did not want to overwhelm with shading and distrct from face features.

Shading could help add beauty and realism or comic to a work. It's fun if you master any style but scary if you are about to start out. You just have to kill that fear and give your best and express yourself...irrespective of the result, just see it as a way of getting better.

One motive I use keep on my mind is: 'my next is my best'.