Hmmm, while the facial expression isn't what you want, I think the greater issue is with the pose. I' d work on putting the left hand over the knee, bringing the right leg forward a bit more and getting that right hand to lay flat on the floor. For the face, you might want to close the lips and use a little bit of a smile over the same side you have it on now to give some upturn to the to the lips (tweak in small increments). I'd also change the color of your shadow light on the right side to get rid of some the harshness in the shadow lines. I wouldn't trash it and with some work, you could definitely pull this off. Start with the pose and then do the lighting. Hope that helps and good luck with it :-)

I think you've done a good job on this image. I would add that the image would look much better with some postwork. Poser figures needs the additional postwork, because sometimes their joints looks weird when they're in certain poses. In addition, you can add effects to the image that you can't do inside of the Poser Application. The expression look perfectly normal to me. There's nothing wrong with it at all:o) Very nice work again!