I went to a Dr Sketchy's a few weeks back for an Illustrators Australia meeting.
Problems with doctor sketchy are:
1 Poses too short- flouncy costumes massively increase detail to get down-so it never happens
2 Models don't hold still.Not even close
3.Can't see what you are supposed to be drawing- can't see what you are drawing. A bunch of stuff and people and poles in the way- and too dark to see the end of your pen.
Strangely the ones at the Glass bar in Brisbane are constantly worried about exposing themselves or wardrobe malfunction.....it makes you wonder
Which is why I kind of goofed off and just did charicatury type drawings.