Final answer:
The best statement for a critique of van Gogh's Starry Night focuses on the formal qualities of the art, namely the artist's use of curved lines to create movement in the depiction of the sky.
Step-by-step explanation:
The piece of art in question is Vincent van Gogh's famous Starry Night, painted in 1889. When critiquing this artwork, it would be appropriate to focus on the use of techniques and the effect they produce rather than personal preference or biographical details which are not part of the artwork's formal qualities. Therefore, statement 3) "The artist uses curved lines to create movement in the sky" fits best in the analysis section of a critique, as it refers to van Gogh's distinctive brushwork and how it contributes to the overall effect of the painting.