The three words in the question that jump out for me are "perspective" and "effective composition." The word perspective could have a number of meanings within the context of art. For example, two point and three point perspective are ways that art historians analyze flat versus three dimensional depictions of real things by artists. Another way of interpreting perspective is a point of view. For example, from this particular artist's perspective the figure or object evoked a certain feeling. Given more facts about the context of the comment would be helpful. If an art teacher were critiquing a student and said "you are continually challenged with effective composition" this would indicate the teacher had an idea of what is effective and the student didn't rise to the challenge. Arguably, there are effective ways to evoke a visual feeling. There is draftsmanship. If an art student could not draw, they would certainly be challenged by a drawing assignment.