(Note: all these images are a little blurry. When I am finished, I'll scan the painting and you will be able to see the detail.)
One thing which always takes me more time are unnatural colors. I am so accustomed to using the colors of nature that when I need to paint something like the dog collar in vivid reds, it takes more time for me to mix the colors. They just aren't second "nature" to me.
I also spent a little time on the background. I wanted it muted, but there were places where it was distracting. I am not done with it yet, but I think it is moving in the right direction.