its amazing but since you asked. its very difficult to find issues from your own eyes when you make it. 1. perspective, unless you have cropped the photo while posting, painting is little zoomed in. you might want to make it little zoomed out and if no then work more on expressions and skin tones/shadows here. 2. again, the skin tones and contrast can be better3. eyes, hairs and skin can take more detailed work.
Again, this is amazing just in case if it helps. I am in the same boat, can’t see issues in my own work.