I actually used a reference for this sexy lady, though I usually do this sort of thing straight from my brain. What can I say, sometimes I have bad days, and need a little crutch. Just to get me through a rough spot.
God, I sound like an addict.
I do like that I made her a bit older than my ladies usually are. Not that I draw exclusively young ladies, but it can be hard to show anything less than extreme age in the line style I prefer. I suppose using reference probably helped a bit with that.