Memory Sketching-Silver inspired

I've always been inspired and influenced by the brilliant work of Steve Silver, lately I've really tried to study his approach.
I've always done memory-sketching of faces, but he introduced this brand new aspect of it, challenging as hell, but fun as Hades-it's memory sketching FACE AND POSTURE. These are a few from my latest stabs.

These peeps were all in my Dr's office. One guy was grumbling to the girl behind the counter about filling out forms.
He kept talking to himself loud nuff for all to hear..."Same SHIT as Last Time!...he had great face and a flesh scarf of wrinkles in back of his head. Another guy walked round with his belt unbuckled, and this girl had a cool belt buckle.
I like these but over all I grade meself b-, c+ for capturing the actual posture...the grumbling guy though is A+!