Here are a few of my favorites, and why.
Anne Hathaway has a beautiful, elongated brow. She does not have
a naturally high arch, and she does not try to attain that. She is a good example of how a flatter brow can be gorgeous. This brow matches her other features - larger and elongated. Perfect.
Kate Winslett has a beautiful, natural brow. Shaped well, but not overly groomed. the right is a bit higher than the left, which is what most women see in the mirror. She also does not have an extreme arch, but a soft lift on the outer third of the brow. A very attainable brow shape for many women.
Angelina's brows are always perfection. A very high arch and always well groomed. Sometimes they seem a bit thicker, and I think that is all due to eyebrow powders or pencils used by her makeup artist. Here, her brows do not compete with any other feature and look great. This brow is not a common one, just like the beauty of it's owner. 
Tina Fay has an eyebrow that is achievable for many women. Full, natural and not too high of an arch. The brow balances her features and frames her large eyes. The arch is placed correctly and they start and end well. This helps to bring focus to her eyes. Brava Tina!
And the Worst Brow Award goes to Sarah Jessica Parker. She has some of the worst brows in Hollywood. The arch is too close to her nose, they are too thin on the ends and start too far apart in front. Just awful. They do nothing for her eyes. All you see are yucky brows. Sorry Sarah, everything else about you is fabulous!
