Blonde ambition....again XD

You need to give us more info.
1. When did you last permanently dye your hair or use bleach?
2. Have you used a colour remover already?
3. What condition is your hair in?

Well, I had friends trying to go blonde from black or dark brown hair... I'm not an expert, but your hair is pretty light already so you should not have any serious issues with dyeing your hair blonde. Especially if you want dark blonde hair. Check out some ideas 🙂 http://www.herinterest.com/50-best-blonde-hair-color-ideas-for-2014/

I think if you are planning on lightening further you will need a good trim first. Your ends look fuzzy and damaged in the pic, this will get much worse if you continue to process your hair. You can safely tone with diluted semis, but it will be an ashy medium brown rather than a blonde.

We will need to know more about your hair history first. Is this a permanent/demi dye you have on at the moment? How long has it been since you last dyed/bleached? What colors were you before this? What kind of condition is your hair in? We ask because if this is a permanent dye it would be best to use a color remover (not a stripper) first like Colour B4, One n Only Colorfix, Decolour Remover, etc. It will remove the artificial pigment, but if you've been using this color or darker for a while you may need more than one application. Because ultimately your hair needs to be lighter and without the ginger tones for a medium ash blonde.