Honestly I don't have a preference... I ink just about any eye color si attractive whether it's blue, green, hazel, brown, or gray... The only one I just don't find attractive is dark brown.
It's just so boring, doesn't look special, almost plain black, and doesn't hypnotize me when I look at them. I have them myself and personally I don't think it's anything special.
I tired looking at your pic I'm nt sure if the light was in your eyes or do you just have nice brown eyes... But you defiantly already have my opinion. If your eyes are brown they're perfectly fine if they're darker than that I do believe you'd look better with brighter eyes.
Brown is my favorite color on a guy, but eye color isn't something that is important to me when deciding whether or not I'll be with a guy. Your eyes are fine as they are. Don't change them because they're a nice color already.