@ Stefan: Working with meshfill in portraits is a very difficult discipline, even a separate discipline from other techniques. It is hard to bring in some real-looking skin effects cause you have to know exactly what you're doing, when start working with meshfill - there is not much or no space for creative improvization or correction in thousands of nodes.
For an Artist who has never been educated in art - this is one of the best technical (in relation to the medium) perfect portraits I've ever seen!