Here’s a way to see faults in a design. Check the grayscale conversion. All touching colors should have a 30% differential – especially for text. If something can’t be read in grayscale (no color cues) adjustments need to be made.
There are various ways to convert to grayscale. In this case, I used GIMP (for Linux) and under COLORS used the Desaturation tool to remove all color. If I run over it with the color picker, it gives me percent grayscale.
Set the gamut to CMYK instead of RGB and use the percent “K” (black) to see the percentage grayscale.
I also use Photoshop to do the same trick but just a little different. Again, the color picker will show percent grayscale in a control panel.