Black is completely toast. For example |16.h417.h318.g619.i520.j921.k922.j723.h7. My last move was terrrible, but black was already in trouble. For example |14.l515.j1316.h517.s6. I'm not sure how I could have improved. My opening was a bad idea. Maybe |6.o8 would have been closer to the balance point.