Secrets Revealed!
...Actually it's pretty damn easy. Just request critique in your artist's comments. Use < h1 >< /h1 > tags around your "critique requested" note (sans spaces, of course) if you want it to be extra visible.
When I first joined dA, there was a nice little check box on the art submission page that you could check off if you wanted to encourage critique. I always checked it. A nice 'Easy Button' for requesting critique. Those were the days. But later on, that nice little item was replaced with the Premium-Only Critique Request Feature thing. A new, special (or speshul) platform was created to request and deliver critiqu