Of the three you've posted with this critique request, I'd keep only the middle one, and would crop it top and bottom, and would advise more visually-informed cropping/framing in general. Checked your MM portfolio also, and the first one there is also "OK for now." perhaps.
I noticed also that those posted in your MM portfolio are a bit dark. I've found that when I convert from DNG to JPEG, it helps to boost the brightness and/or white point a bit afterwards, and before posting them here, as the luminance seems to diminish during MM's upload process.
As to improvements possible, I like the locations for the first two MM portfolio shots, but the poses aren't all that wonderful. I'd go for more dynamism and action, and bringing the model into the foreground a bit more.
Realize that when you are just starting to shoot with the agencies, they are going to send you only their newest models - a chance for both of you to develop your skills. Your model wasn't that skilled yet at conveying much with her body or face, so it's not ALL your fault, although your becoming a director skilled enough to overcome that will also be necessary.