OK, Steven , I've got it. It was good to decide to dust off and post it. I have some (understatement of the year!) problems into this. As you picked it apart (many thanks for it!) : I've some lack of matching of the likeness/form, the values -- a really complex thing -- and colors-- another tricky stuff. Well again and again, I recognize how my eye is exercised weakly.

And how far I am away to see the things just like you all. A relevation, what kind of putative "little" details (in mine eyes) , so big connection stands.
Yes, I didn't match that steel blue of her shawl. Although, the photo shows some higher contrast, it is wrong. I still paint with too intense colors. I must study to make it more naturally. Recently I decided to reduce my palette to 3 tubes: Cad Red Deep, Cad Yellow Light and Cerulean Blue. I know they have heavy tinting power all. If I learn to handle with these, can I extend my skill in color mixing. My last picture is painted so. It goes very well. But I think about this famous "Paxton Palette" too. I did a search on ARC after Paxton.....it has sufficed.
Values.. Do you have an idea how I can learn it faster and better?Oh no! I know: squint, mind, practice.
Many thanks for your critic! Critic helps always.
Cheers.