This is going to come off as harsh, but hopefully will help you improve your craft if you can understand that it is meant constructively, and work on some of the things I mention.
I think this is the only photo in your portfolio that is even salvageable as a starter image for a portfolio that will start getting you trade shoots with models that you'd want to be shooting with, although it is by no means great:
The rest suffer from a number of things, including terrible lighting, poor composition, no sense of model direction, no concept, and frankly, poor choices of models.
For lighting, perhaps invest in taking some classes, or offer to assist some local photographers who are producing quality work for free. Unless it comes to you naturally, which it clearly doesn't, lighting is something that is generally learned through practice and through trial-and-error. So maybe spend a lot of time studying the work of others, and see how you can incorporate lighting concepts you learn through practice and through study into your own work.
Look at some of the best model photography around, and study composition as well. For the most part, it seems to be an afterthought in your work, if it was even a thought at all. A random knee in the corner here, a hand hanging out of frame there, a shot taken with the camera held at some kooky angle - all point to a lack of thought in terms of composition.
Come up with concepts you want to shoot, and figure out well in advance of the shoot how to pull them off. Random half-dressed woman in a dog crate wearing jewelry = bad concept, if any thought went into it at all. Come up with something interesting and unique - perhaps that vintage car could be put to use! And then figure out on set how to direct, dress, make-up, and so on your model so that they fit the concept, remembering lighting and composition, and perhaps start walking away from each shoot with better and better images.
And finally, it seems like you're going for a glamourous look with your photos. Find models appropriate for glamour work. The models you have are not age-appropriate, build-appropriate, or in any other way appropriate for the sort of work I vaguely get the feeling you're trying to create. Of course, it's really hard to tell with such an amateurish sampling, but if you master the basics of lighting and composition, and practice, practice, practice, you'll get there!