A have a few opinions for you. First of all, forget the scarf. Not good outside, not good in low light. Concentrate on the poses and lighting.
She is a nice looking lady and with practice, will find her style that works for her. I suggest she look at magazines and get a full lenght mirror and practice as much as she can. Both of you experiment with many sessions and look at every image on the monitor of your computer and see what is good or bad with each one.
As for you, use a tripod, take your time with the compositions, study the light before and after the shot, look at the area around your model, use the histogram, and focus on the eyes. Additionally, go for the unusual locations and poses, give her props to mix the shots, lots of clothing and hair changes and always look at her hand placement.
A good, bright image with lots of saturation works most of the time. That means lots of light from fill reflectors and, or flash. You seem to have lots of cloud cover on this session which cuts the light from the sky onto her face. Next time, I am sure you will get more "keepers".
By the way, there seems to be sensor dust on the upper left side of your verticle images.
Final note, the makeup on Erika looked strange in person but great on film. I cannot stress the importance of good makeup and a good MUA! The difference between a snapshot and a professional image is the use of good lighting, good contrast and saturation, the pose, makeup and interesting location. The work the photographer spends in post production pulls it all together.