Eye Tracker Progress - Touchy!

I have done some more on my eye tracker - with adding a layering effect of the eyes.. It is quite interesting because it sometimes recognises and sometimes doesn't but here's a picture to show progress

On the left is the tracker finding my eyes and painting spheres over them.. then the right is the feedback in the mirror, with two dark circles altering the colour of my eyes..

This is a close up but its not quite as obvious as I would like .. Still attempting to make it to darker without making it look fake.. Left it captured image and right is altered image.

This one is slightly better but the circles are quite wide it looks like shadow casting - I am going to work with the shape a little tomorrow to try and get it more precise yet the colour contrast is quite nice..