I don't know much about modelling, but if was an agent and I saw these photos they would likely go straight into the trash. The poses are awkward looking and the clothing doesn't exactly scream 'model'. From your end as the photographer you need to direct the poses, which is hard to do at first but it's essential to learn.
Some points I can make about portraits - you're trying to show off the person, not the background. Get in tight with the framing and try to blur the background as much as possible by setting up the shot and camera settings and lens choice correctly (large subject to background distance, use a telephoto lens if possible and a large aperture). For a head and shoulders portrait it should be exactly that - head and shoulders, not a wide framed shot with the subject slumped across a table. Use the camera in the vertical orientation (also known as the portrait orientation for obvious reasons).
On all the body shots you need to get in much tighter, the subject is being dwarfed by the surroundings. Arms folded is never a good pose for photos unless you're trying to go for a tough guy look, which is not really the case here.
What are you using for lighting? The lighting on the model's face looks good so well done in that respect.
Hope you find these tips helpful. Keep trying until you nail it.