Very nice work Rob!
You have achieved a very pleasing image with nice colour balance and overall processing and there is good colour in the stars too.
Of course longer subs would be great if you feel like it but while you are cutting your teeth 2min will do the job on many bright nebulae and reduce the risk of a breeze blowing the stars around during exposures or something going wrong with the autoguiding etc and if that happens you haven't lost too much of what I know can be very precious imaging time
I notice some mild edge of field distortion, you said you have a field flattener was it in place for this image?
Great work
Mike