The repair shouldn't cost you anything.
To the extent possible, you should evaluate samples in your yard, both wet and dry. Surrounding elements affect your perception of color. Not to mention what a computer monitor does to color samples viewed online.
Things like the color of your house, the color of the deck, the fence, your neighbor's walls, trees and shrubs, etc. all affect how your brain will perceive the colors of your choices. Viewing your choices onsite is the best way to minimize disappointment.
That said, I always prefer darker colors. But darker colored pebble/plaster will likely show more mottling. I don't mind mottling at all, as to my sense of design it adds an organic feel. River and lake and ocean bottoms are not one solid color, but rather a collage of colored patches of this and that. That's what mottling simulates to me, so darker plaster is fine for me in that regard. I like the more dramatic look of darker colors, and there's at least some school of thought that the darker the bottom the warmer the water.
The flip side is that the lighter the plaster color the better your pool light(s) will perform. Darker colors tend to suck up the light, especially colored LED light.
That said, based on how the swatches look on my monitor, I'd say you've done an excellent job on your color palette. It all looks good. That multi-color tile ties lots of colors together, including landscaping and the walls of your house. (The cinder block wall not so much, but it's grey so it's not causing any visual tension.) If you later paint the house or the wall, you'll have lots of colors to choose from that will go with your tile.