What color highlights should I get?

What color highlights should I get? I have medium brown hair and got copper blonde highlights, but it makes my hair look really orange/yellow. Especially on top, its really yellow with the dark brown streaks, looks almost like black streaks. how long do I need to wait to fix the problem, change color? help.

some kind of light or medium red

Hm, it'd be better if I can see a picture. But, I like to keep it a brown color. Mabey do a darker (from roots) to lighter. That's how mine is, but in blonde. The ends are like a little blonde/a really light brown. Then you can do a soft red over it, then it can have a little mahogany touch. Love those kind of hair style.

I think you should try a different shade of blond.