What color?

It depends on what colour it's being put on. What is your hair colour now?

My natural hair, dark brown.

It looks copper to me.

Your best bet is to bleach your hair to ginger/dark yellow with a good quality bleach and low volume peroxide. Then use Adore dyes in various shades of copper/orange and maybe a hint of brown to mix the perfect shade you want.

Yeah doesn't look like one single shade to me, looks like various shades of copper

I'm not sure what colors to mix to get it, but it is super pretty, also I just had to comment on the models hairstyle, I am growing out a pixie and that is what my over grown pixie looks like when I wake up in the morning, lol