Does your doctor have revision policies for tweaking results after procedures? If so, talk to your surgeon and consider having one. However, the revision would have to take into account your nipple blood supply and protect it. You still look generous (not unusual after reductions) so you could consider even going down even more in size.
Also, if your communication with your surgeon was not very good, see if your surgeon is willing to critique what was done and to see if there were possibly better ways of achieving your anticipated results. Bottom line, you had a reduction and are smaller. But in the ideal world, we would like for them to look as good as possible as well.