The ribs look good yet could use a little sheen. The difference would be to give a first impression of moisture not of dryness. I would like to see the ribs a little bit darker too.
The garnish, frankly, looks like it was quickly thrown together without too much thought and does nothing to present the meat -- in fact it distracts.
The diagonal doesn't bother me, but might lose you a few points from other judges.
I would give you a 7.