I can't believe no one has replied to this thread yet. The dithering and colouring are both amazing, I love the ambient green highlights on the third image. Generally that second image is anatomically fine, unless you're a nitpicker, I don't think many people would notice any anatomical flaws at all. I think you should continue with it, if you feel there are anatomy issues, fix those, but please continue with it, it looks great.
The third image would make an excellent avatar or character portrait.