to go dirty...blonde that is

I feel like it's time for a change. I have been wanting to change my hair color lately, I went through a phase where I REALLY wanted ombre hair until I realized
A. my hair isn't long enough to look good
B. Its a lot of work just to look like my roots are really bad...

But now I think I want to go almost my natural hair color {but a richer more colorful dirty blonde} with highlights shaping my face. My inspiration is this picture:

I need some feedback. How hard is it to go a little darker when you are blonde? Should I do it?!

I think it is so pretty and natural. I just need some motivation.