Day four is monochrome. I opted for white - pink - dark pink - black as my colour scale.
I did a colour block mani during January tri-polish Tuesdays (which I won't be participating in today due to time constraints) and loved it so took a similar approach here.
Here was my colour spectrum, the OPIs are My Boyfriend Scales Walls and Steady as She Rose.
Here are the other NAGGs.