The paintings were a deliberate intent to be different. The background of Obama's includes flowers from all the places he's lived, like the state flowers of Hawaii and Illinois, and flowers from Kenya to honor his father. The greenery is supposed to represent how they all came together and intertwined. At least that's how the artist generally explained that background. The portrait itself is very well done.
I love Michelle's. The sweeping gown is gorgeous, and I just love the graphic designs on it.
It's a risk to sit down and give an artist free rein to interpret their subjects, isn't it? You never know what you're going to get. I appreciate not wanting cookie-cutter studies, though. Good on them!