g'day Dylan!
mate the thing i'm most imporessed with in your eye are the blends.. that shows that you're control is definitely improving - and some of your dagger strokes are spot on.. normally is you can do one perfect then the next is perfect so i think you're really close.
The best advice i can give at this stage is to have a good look at the eye reference - What you need to do is break it down by doing the following:
look for areas of the eye that you know you can create using the airbrush - whether it's a line, a blend or a dagger stroke and decide where there's simple parts of the eye are, and how you're going to attack them the next time you give it a go.
When you have found these easy effects, i want you to start looking for the more difficult effects. These will be combinations such as 2 blends, blending towards each other. or two soft dagger strokes coming from either side of the artwork.
take a look at this tutorial i wrote for the eye:
http://www.airbrushtutor.com/airbrushing-the-eye.html - if you've seen it already then it may help to read through it again but i'm really trying to focus on the idea of finding shapes in the reference, and sitting down and thinking of how you can actually create those shapes with an airbrush.
This tutorial is to teach you that it is not about creating one artwork.. it's about perfectly creating a bunch of shapes using the right effect, right height & right intensity and stepping back to see that you've created an eye. Focus on the little things and plan how you are going to airbrush it

thinking about how to attack it is half the artwork and will increase your speed too!
hope this helps..