Not sure. Credits aren't listed anywhere on the interior, and neither OS nor Gerber list the cover artist. My guess would be Kinstler did it, as he drew the covers for a lot of these Avon one-shots.
At first I was about to say that it wasn't Kinstler until I checked my Kit Carson and for the gal, notice the same turn of their left shoulders and the same way the elbow is handled. Same goes for the hair texture. Seems like Kinstler then -
I'm reading Kinstler's name on the bottom of the right corner of the cover.......
what's not clear about it? just realized it wasn't the kit carson you were talking aboout note to self read before typing