At my DD's last ice dance test, the evaluator commented on her posture, carriage, graceful arms and general quality of motion, and toe point. When we explained that she studies ballet fairly seriously she nodded and said that she had suspected that already based on the perfect bun and head position, and, that ballet, well-studied and well-taught, would certainly explain the neat posture, etc. Modern dance, well taught, will also help with musicality and interpretation and performance quality.