Aaaah I love marquise cut gems, I was trying on sapphires and semi precious stones the other day! Too bad they are not very popular, if they are set in classic aristocratic old European style sets they are amazing. Unfortunately the '80s gave the marquise a bad name... And Sex and the City practically called them an abomination.
I say yes to the halo and side accents, and I will go against the popular demand for east west, I prefer classic north south.
EW makes fingers looks stubby, NS elongates the shape of the hand.