Color dominance affect is interesting in Fair Isle designs.
I did the sleeve design with the Contrasting Colors dominant by always bringing the CC yarn from behind the background yarn so it travels more entering the front more perpendicular , a little looser, and stands up more in the design. I kept the background (Fossil color) closer to the back of the fabric and passed it infront of the CC yarns when switching so it has a shorter travel and lies flatter. I'll try working the yarns the opposite on the yoke to see if I notice the difference of the background yarn evenly dominating just a little bit over the other colors with this yarn.
The sweater in the pattern's photos look like it was knitted so the contrasting colors are dominant, whereas the sweater on the MASK site advertising the KAL looks like it is knitted so that the background color is dominant. I find both attractive. Main thing is to keep the dominance consistent as you knit that area.