I think it will be a fantastic OBW fabric.
I wouldn't hesitate with the darker solid areas. They are not that large of an expanse, and what it will do is give you a variation of some blocks being busier, and some a little quieter. Those will give your eyes a bit of a resting spot.
IMHO some of the OBWs just get too busy and with too many colours that they are just a jumbled mess. So another reason why I think this one will work fantastically well!
The contrasts of the white and pink against the darker chocolate and greens will give lots of pop to your quilt. Plus the fine outlines will create some interesting effects too.
Look forward to watching you create a wonderful OBW!!