I kinda like the expression on the first one better, as well as seeing the light ripples on her ass, an ass that full would have more bounce to it. I also don't think her hands would move like they do in the redraw, normally the biceps and wrists give way before contact with the table changes.
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The first time you slap her ass she should feel shock, the second time it should be surprise at the fact that she's enjoying it. The original face react looks like how the first slap should look and the redraw is how she should react during the second slap.
Fun fact, due to how nerve endings are distributed in the female body when you slap a woman's ass the vibrations carry in the in to the lower abdomen and hit the fine nerves in the back of the vaginal canal, this is is why some women report a tingle in their pussy when they are slapped; the effect is mostly felt when the muscles are relaxed and receiving extra blood flow, like when a women is aroused.