Have you considered doing some shoulder exercises?
I found those along with back and ab work REALLY helped my posture and contributed to having a decent midsection. I'm curious as to what back weight lifting exercises you plan on doing as well. It looks like you're making good progress and learning, I noticed you knew when it was time to change your scheme a little bit which is good, lifting and working out near full capacity(or at least somewhat taxing depending on your goals) is what gets results.
From the bodybuilding site I used to frequent I found that a lot of the girls really loved leg exercises especially squats, they work your glutes, quads and hams, basically the whole leg but they are challenging.
Are you currently incorporating any leg routines or at least lower body?