Man! Fred! Talk about hitting the ground running!!! Okay so the arm probably shouldn't be there, but you did a fantastic job. Great model too. You need to go ahead and reschedule her NOW before she gets too booked.
I know this is a picky point, but I believe your makeup artist (or model) used the wrong color base. When arms and face are so close together, as the are in this image, the delta is quite noticeable. You can try to mask and color match a little, but I usually get around the issue by converting to B&W where tone matching is much easier.
I agree with Woody on the arm placement. It's a most difficult pose to work with. I've found if the elbow is to the side it can look better, but it still only works on certain body types.
Well done on the other technical aspects and the model is very attractive!