Hey Konrad von Richtmark! As I have said - this model took me about an hour of work (he is fairly simple, not too much colours either). For an hour of paintwork I charge 120 czech crowns, which is approximately 4,2 pounds/ 5,5 dollars. I was also recently commission with more than 60 40K orcs to be painted in 40 hours, but they didn't look that nice...
That sounds like a very generous hourly rate. Would you be able to do two or even three models per hour, if using quick and "good enough" techniques? Just to show an example of my own:
This guy was made the same way I'm doing all my state troops: Flat colours for everything first. Wash everything in black except for skin and facial hair, which is washed in flesh wash. Leave everything else as is, but re-highlight the cloth and the skin with the same colour that was originally used.
It's nothing fancy, but satisfactory for my purposes. I probably wouldn't commission anyone to paint me Empire, I'm rather thinking about another, new army all in one go, but this should showcase the quality standard I'm looking for.