I'll start with this: some experience is better than no experience as long as you learn something doing it. Anything I'm about to say is to help you achieve your goal to be part of a modeling campaign for diabetics who feel restricted by their illness.
Put simply, agencies and photographers look for a basic concept in a model's portfolio: your looks (obviously). They want to see your face in a headshot, your body, and what you can do with both of them (a variety of expressions and poses).
I looked carefully at each image in your portfolio right now and searched diligently for the best of three elements. Of the available images, I found two worth keeping in that regard:
(I think this should be your avatar, it's lovely!)
Here are some tips about how to improve some others in your port:
I really like the composition of this image and the expression on your face in this one:
The retouch overpowers the real impact of this image: you.
This one isn't bad either, except for the ginormous photographer logo at the bottom:
So here's what I would suggest if you really want to get serious about building your portfolio in a way that will help you reach your goal: take out the extras, keep the essentials, and work with photographers nearby who have a good eye specifically for composition and for consistent lighting.
I did a search for photographers in your area and found one that might be a good candidate for that. I don't know them, I've never talked to them, I've only looked at their portfolio and recommend them purely on their final results so far. http://www.modelmayhem.com/2877600
A final recommendation on posing. Don't tip your face to the camera. Turning right and left and straight are going to be your best friends for your facial shape. Practice this with a competent photographer and your portfolio will grow in quality and hopefully get you where you want to go.
I hope this is helpful. Good luck!