The stars are nice and tight - a bit faint and a shade green. So well done.
Advice - processing - Photshop CS or MaximDL - levels and curves to boost the signal - maybe go a tad longer on duration but don't blow out the core and check colour levels of your camera against a white reference star (G2V) (some in the Southern Cross) i.e.
http://www.astropix.com/HTML/I_ASTROP/CUSTOMWB.HTM
With only basic processing - it looks like this