How was this lit? Was it outdoors on an overcast day? In general, you want to get light into someone's eyes in a portrait. Here they are completely in shadow and look a bit like black holes. If this was outdoors, having your subject face open sky or using a reflector can really help.
It is a nice portrait, the focus on the eyes is a little soft and they are missing the catch light that transform an average portrait into a good one.
But I think your lighting is good, the pose and smile are very nice and that blue makes the complexion stand out.