I got 14 working for me right now and 2 that are in training (wich is almost done ... 10-15 more flyers and they will be good for fulltime) .
If you want to get good quality services, you MUST give them time to get inspiration ... thats the only way . You can't pop good ideas out of your head every 10 minutes ...
My best one, Jayson, can take 2-3 hours sometimes just looking at picturse to feal what he wants to do ...