This first image is a very straight onto the camera pose and whilst it works well for a statement of confidence and strength is not very feminine. When I shoot men this pose works very well. Asking Heidi to tilt her head a little but still look at the camera created a much softer friendlier image
Sticking with a fairly straight on viewpoint Heidi then tilted her head towards the camera, firstly by a little amount then much more
The two images are barely different, however, they convey very different emotion. By looking upwards with a downward tilted face Heidi seems to look a little impish, like a naughty child, whereas the forward looking pose is again open and honest. Perhaps we inherit this view of the posture from how children look down when guilty and yet try to turn their eyes upwards to see what is going on.
In the next image Heidi again faces the camera but her eyes do not engage:
This creates a look of boredom and disengagement - the fact that she is facing the camera implies she needs to be there, but the eyes say that she does not want to be there. Moving on the next 3 images show different degrees of turning away from the camera:
The final image works best, if only because her eyes are open. They also look more candid.