Blah...selective desaturation. I think the dogs pull too much focus in an otherwise pleasing composition. I think if this had been shot on an actually cloudy day, you could have succeeded with color by blurring the background and eliminating the dogs and the subjects patterned shirt. Oddly, the umbrella appears a bit pale and washed out to me.
Nice use of selective desat here. IMHO I think you could have made the shot tighter to weight the person heavier in the composition. This may have increased the impact of the umbrella. If in full color, your current composition would be perfect. But with the selective desaturation, I don't think as much of the landscape is needed in order to make an impact here.