With "The Mittens" layer selected, I am going to first try the "Brightness/Contrast" tool to see if I can improve the color by adjusting the Brightness and Contrast. I can access this tool by going to the "Image" menu, scrolling down to "Adjustments" and sliding over and down to "Brightness/Contrast."
I'll adjust the "Brightness" and "Contrast" until I'm happy and then click "OK."
Next, I'll play with the "Hue" and "Saturation" values. I can access the "Hue/Saturation" tool by going to the "Image" menu, scrolling down to "Adjustments" and scrolling over and down to "Hue/Saturation."

The "Hue/Saturation" dialog box pops up and, by adjusting the "Hue" and "Saturation", I get a color closer to what "The Mittens" really look like.

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