Kel, if I may:
I just feel there is an emptiness in Janice's eyes. I cannot feel a sense of "living" in those eyes, much less seduction. I will even go as far as to say she looks jaded. I am not too sure if she is tired or not, but based on what I see, she does not seem to be connecting with you when you made that shot. Ultimately if it is a lingerie shoot, I will expect a little playfulness and "come hither" kind of expressions. I just do not catch it in these photos.
Couple of points here. I am thinking here she is lying on her left hand either outstretched or bent at the elbow. Her collar bone already shows that she is not "balanced" in terms of the shoulders as this is a front face shot. Agree with Virgo that the shoulders being cut off brings down the sense of seduction somewhat as most, or in fact all lingerie pictures usually have shoulders exposed as the art of seduction comes from the face, eyes, collar bone and shoulders, though not necessarily in that order. At the same time, a lot of her neck is covered by hair. Again, the neck area is typically one of the more sensual areas of the female body, so exposure of the neck here may add to the feel. But ultimately the eyes do not say it.
For Jocelyn, she has a very sweet look and being in a big white man's shirt is alluring. Will not go into the background distractions here as virgo has said it. You may want to watch the pose. Seems that a lot of weight is going into the hands. Going forward, the right leg seems to have a larger thigh profile. The leg could have been extended a little bit more backwards and moved further back to give it more length from the angle that you were taking.
Overall, I prefer Jocelyn's picture to Janice as the expression of Jocelyn lends more to the picture. Janice's picture unfortunately falls short in a lot of areas, especially in the area where if you want to express seduction.