Many colors of eyes are good, including the brown ones. But the brown eyes are attractive. You could use the colored contact lenses to make you look like this. And the brown eyes will be looked foreign when the Asian people own. You could go to the online store to search such type of colored contact lenses.
Actually, the function of brown eyes and other colors of eyes are the same, the only difference is they appears with different color. Some people want enhance eye color and make it look more vivid, and they think that green, blue, and gray eyes are more beautiful than brown one, but I think that's OK with any color as long as your eyes are healthy.