It looks very pretty. It reminds me of the effect from rollersetting with sponge rollers; I would not have thought that you only rollerset the ends if you had not stated so.
I got my hair relaxed bone straight (BY ACCIDENT) almost 2 years ago, then I transitioned for 7 months. I got spooked and texlaxed last Jan. THEN I slapped myself upside the head and started transitioning again.
SO - I think the back is completely natural - but moving through my head I have 3-5" of texlaxed hair, and 2-3" of bone straight ends. I mini-chopped once (last apr), so that's how I got rid of the texlax in the back.