That's the reality, no way around it.
Be prepared to see some grey. The water itself adds a lot of blue, so to get the pool to look blue, they actually back off the blue color in the mix. So the deep end will be nice and blue, the shallow end a little grayer, steps will get grayer as they ascend, and the top step or benches or tanning shelves will look very grey.
Choosing your color via internet can lead to disappointment. The color you'll be seeing is not only dependent on how and when the image was photographed, but by the quality and color fidelity of your computer screen. It's best to see pools in person, at various times of day. But even then, your house color and fence color and the types and heights and amount of trees and shrubs will all end up affecting what you choose.
You just have to do the best you can knowing 1) it might not be exactly what you were after, and 2) it's still going to look fantastic. So don't beat yourself up about color, before or after.
You won't lose sight of your kids in a dark colored pool. Plus, as Poolmama points out, the color will fade with time, so it's going to end up lighter eventually, and perhaps grayer.
This image illustrates some of what I am describing. The shallow end looks greener because it is reflecting my tan house. Shadows in the deep end almost start to look purple, and the deep end is a medium blue with turquoise tones. Check out the bench in the corner: grey.
Your pool will be multi-colored and constantly changing, throughout the day, the year and its life. Embrace it.
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