It took us four tries to visit the Eiffel tower due to inclement weather. If there is even lighting in the valley miles away, the tower is closed. We had to settle for visiting it during the day since it was our last night in Vegas.
The views are amazing from the Eiffel tower, despite being only 50 stories while it's older brother in the other land is 100 stories tall.
Definitely try to come here during sunset for the best sky, and at night for the lights. Broad sun light may pose a problem while taking pictures. Also, use the openings in the gate for positioning your camera.
Cheers