feria or preference?

Feria is a direct dye and very difficult to remove if you decide that you don't like the color.  So, I'd use Preference...get it at Sally Beauty though rather than the drug store.  So you have Dark Brown Hair?  If you want a reddish brown that looks real in my opinion you should try Miss Clairol 46 D, Chestnut Brown.  Get a 30 or 20 vol. peroxide.  Strand test first, but I think this might look good.  It's two levels up from your hair color, a green based dye to counter the "RED" you have, plus it has a bit of the red that you are wanting.  I hear it's a warm color even though it's got a green base to it.  If you want more red you can mix this color with 47 R, Red Ginger.  I'd go 3/4 of the Chestnut brown and 1/4 of the red or half and half.  PLEASE STRAND test and do stay away from Feria if you don't want your hair to look fake, it's a very BOLD dye.  Good luck and post pics when you finally do dye your hair.  Let me know how the above turns out.  I think it would ROCK! 

Okay, please strand test prior to doing the entire head.  Especially since you have two toned hair.  It may look different than you expect.  Good luck and let us know how it turns out!

YES, I think it's a beautiful color too.  I Haven't ever been able to try it myself, as my hair is too light.  Did you color it yet?  Or is your friend doing it for you tomorrow?  Listen don't forget if your hair is lighter on the ends that the color may not be even.  You might want to use a neutral protein  filler on the mid section and ends to keep the color from grabbing too much...Just an idea.  Strand test first and then you will know for sure.